Why wouldn't an imported theme's variables be working? - css

I've been banging my face against my monitor for hours trying to figure out this issue that seemingly no one else is experiencing, so here we are.
I'm learning ASP.NET and working on using themes from bootswatch in my CSS folder. The bootswatch and bootstrap versions are the same (5.1.3), but the code is broken anywhere that involves a variable in the CSS file that I brought in. I'm only going to be using screenshots in this post because the files are huge and the error is what's important.
Additional info:
All packages/extensions are up to date, all variables are declared and initialized in the CSS file, and here is a link to the theme I'm trying to use: https://bootswatch.com/darkly/
Thanks for any help anyone can provide.
and my _Layout file looks like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>#ViewData["Title"] - LearningAspNetWebApp</title>
<link rel="stylesheet" href="~/css/darklyTheme.css"/>
<link rel="stylesheet" href="~/css/site.css" asp-append-version="true"/>
</head>
<body>
<header>
<!-- The following is copied and pasted from bootswatch Solar theme to trick out the nav bar-->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="container-fluid">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarColor02" aria-controls="navbarColor02" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarColor02">
<ul class="navbar-nav me-auto">
<li class="nav-item">
<a class="nav-link" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
</li>
<li class="nav-item">
<a class="nav-link" asp-area="" asp-controller="Category" asp-action="Index">Category</a>
</li>
#*<li class="nav-item">
<a class="nav-link" href="#">About</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-bs-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</li>*#
</ul>
<form class="d-flex">
<input class="form-control me-sm-2" type="text" placeholder="Search">
<button class="btn btn-secondary my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</div>
</nav>
<!-- End Trick Out-->
</header>
<div class="container">
<main role="main" class="pb-3">
#RenderBody()
</main>
</div>
<footer class="border-top footer text-muted">
<div class="container">
© 2022 - LearningAspNetWebApp - <a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
</div>
</footer>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
<script src="~/js/site.js" asp-append-version="true"></script>
#await RenderSectionAsync("Scripts", required: false)
</body>
</html>
And here is my folder structure:

Related

Bootstrap dropdown-toggle doesn't toggle

I'm at my wits end. I started up a new ASP.Net core web app and am trying to add a simple menu with a dropdown. However, the dropdown won't toggle open.
(And when is stackoverflow going to remove the ridiculous "issue" of you need more content to match the amount of code you're posting. Sometimes a question is short! Thanks!)
The dropdown:
<li class="nav-item dropdown">
<a class="nav-link text-dark dropdown-toggle" data-toggle="dropdown" asp-area="">Json</a>
<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a class="nav-link text-dark" asp-area="" asp-page="LoadJson">Load Json</a></li>
<li><a class="nav-link text-dark" asp-area="" asp-page="BulkLoadJson">Bulk Load Json</a></li>
</ul>
</li>
All the code in the page:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>#ViewData["Title"] - DataMagnifierAdmin</title>
<link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
<link rel="stylesheet" href="~/DataMagnifier_Admin.styles.css" asp-append-version="true" />
</head>
<body>
<header>
<nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
<div class="container">
<a class="navbar-brand" asp-area="" asp-page="/Index">DataMagnifierAdmin</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="navbar-collapse collapse d-sm-inline-flex justify-content-between">
<ul class="navbar-nav flex-grow-1">
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-page="/Index">Home</a>
</li>
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-page="ExecETL">Execute ETL</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link text-dark dropdown-toggle" data-toggle="dropdown" asp-area="">Json</a>
<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a class="nav-link text-dark" asp-area="" asp-page="LoadJson">Load Json</a></li>
<li><a class="nav-link text-dark" asp-area="" asp-page="BulkLoadJson">Bulk Load Json</a></li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link text-dark" asp-area="" asp-page="/Privacy">Privacy</a>
</li>
</ul>
<partial name="_LoginPartial" />
</div>
</div>
</nav>
</header>
<div class="container">
<main role="main" class="pb-3">
#RenderBody()
</main>
</div>
<footer class="border-top footer text-muted">
<div class="container">
© 2022 - DataMagnifier_Admin - <a asp-area="" asp-page="/Privacy">Privacy</a>
</div>
</footer>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>
#await RenderSectionAsync("Scripts", required: false)
</body>
</html>

Change data-toggle="dropdown" (Bootstrap 4) to data-bs-toggle="dropdown" (Bootstrap 5).
See the snippet below.
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.2.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.2.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script>
<li class="nav-item dropdown">
<a class="nav-link text-dark dropdown-toggle" data-bs-toggle="dropdown" asp-area="">Json</a>
<span class="caret"></span>
<ul class="dropdown-menu">
<li><a class="nav-link text-dark" asp-area="" asp-page="LoadJson">Load Json</a></li>
<li><a class="nav-link text-dark" asp-area="" asp-page="BulkLoadJson">Bulk Load Json</a></li>
</ul>
</li>

Why bootstrap dropdown does not work in my ASP.NET Core?

I am doing simple web app in ASP.NET and I want to show options from dropdown menu, but it does not show any options. In another app I did at school, it worked perfectly.
Here is my code that does not work:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>#ViewData["Title"] - Blogic Project</title>
<link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
#await RenderSectionAsync("Styles", required: false)
</head>
<body>
<header>
<nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-dark bg-dark border-bottom box-shadow mb-3">
<div class="container-fluid">
<a class="navbar-brand" asp-area="" asp-controller="Home" asp-action="Index">Blogic Project</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="navbar-collapse collapse d-sm-inline-flex justify-content-between">
<ul class="navbar-nav flex-grow-1">
<li class="nav-item">
<a class="nav-link text-light" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
</li>
#{
#if (User.Identity.IsAuthenticated == false)
{
<ul class="navbar-nav navbar-right">
<li class="nav-item"><a class="nav-link text-light" asp-area="Security" asp-controller="Account" asp-action="Register"><span class="glyphicon"></span> Sign Up</a></li>
<li class="nav-item"><a class="nav-link text-light" asp-area="Security" asp-controller="Account" asp-action="Login"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
}
else
{
<ul class="nav navbar-nav navbar-right">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown">Logged as #User.FindFirstValue(ClaimTypes.Name)</a>
<ul class="dropdown-menu dropdown-menu-dark">
<li class="nav-item"><a class="nav-link text-light" asp-area="Security" asp-controller="Account" asp-action="Logout"><span class="glyphicon glyphicon-log-out"></span> Logout</a></li>
</ul>
</li>
</ul>
}
}
</div>
</div>
</nav>
</header>
<div class="parallax">
<main role="main" class="pb-3">
#RenderBody()
</main>
</div>
<footer class="border-top noparallax-footer footer text-muted bg-dark border-bottom box-shadow">
<div class="container">
© 2022 - BlogicProject - <a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
</div>
</footer>
<script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>
#await RenderSectionAsync("Scripts", required: false)
</body>
</html>
The problem is in this tag:
<ul class="nav navbar-nav navbar-right">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown">Logged as #User.FindFirstValue(ClaimTypes.Name)</a>
<ul class="dropdown-menu dropdown-menu-dark">
<li class="nav-item"><a class="nav-link text-light" asp-area="Security" asp-controller="Account" asp-action="Logout"><span class="glyphicon glyphicon-log-out"></span> Logout</a></li>
</ul>
</li>
</ul>
Wanted output from another project:
I am still a student and it's the second time that I make something in ASP.NET.
Thank you.
EDIT: tried adding jquery before bootstrap and still does not work.
EDIT2: works with that change
<script src="https://cdn.jsdelivr.net/npm/jquery#3.5.1/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.6.1/dist/js/bootstrap.bundle.min.js"> </script>

You have to refer to jQuery before Bootstrap.
You could see the two results:

On my web page, there is free space on the left, and right. How to get rid of it?

Firstly i tried to do margin:0, and padding:0 for body element. But it didn't work. I inspected it to see what's going on google developer tools. I saw my .container-fluid class which has some bootstrap properties by default, has padding in left, and right. So when i write in developer tools; .container-fluid{ padding:0} it works, it deletes that free space. But when I do it in my css file, it doesn't work. Since I didn't want to use !important keyword, cause I think It must have worked...So I need your help, what's my mistake? Thanks.
.container-fluid {
padding: 0;
}
.title-image {
width:100%;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Python Bootcamp Web Page</title>
<link rel="stylesheet" href="styles.css">
<!-- Font Awesome CDN -->
<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>
<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
<!-- JavaScript Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>
</head>
<body>
<section >
<div class="container-fluid">
<!--all of element appeared when i wrote navbar-expand-lg-->
<nav class="navbar navbar-expand-lg navbar-light bg-info">
<a class="navbar-brand" href="#">
<i class="fab fa-python"> Python Bootcamp</i>
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav ms-auto">
<li class="nav-item">
<a class="nav-link" href="#">Courses</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">How We Work</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Outcomes</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
<!-- Title -->
<div class="row">
<div class="col-lg-6"> <!-- so it will fill 50% of width on screen of laptops, and bigger screens-->
<h1>Download the best bootcamp, and start to study now.</h1>
<button type="button" class="btn btn-lg btn-danger"><i class="fab fa-apple"></i> Download</button>
<button type="button" class="btn btn-lg btn-light"><i class="fab fa-google-play"></i> Download</button>
</div>
<div class="col-lg-6">
<img class="title-image" src="image.jpg" alt="classroom-image">
</div>
</div>
</section>
</body>
</html>

Just take the navbar out of the container...
<section>
<nav class="navbar navbar-expand-lg navbar-light bg-info">
<a class="navbar-brand" href="#">
<i class="fab fa-python"> Python Bootcamp</i>
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav ms-auto">
<li class="nav-item">
<a class="nav-link" href="#">Courses</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">How We Work</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Outcomes</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
<div class="container-fluid">
<!--all of element appeared when i wrote navbar-expand-lg-->
<!-- Title -->
<div class="row g-0">
<div class="col-lg-6">
<!-- so it will fill 50% of width on screen of laptops, and bigger screens-->
<h1>Download the best bootcamp, and start to study now.</h1>
<button type="button" class="btn btn-lg btn-danger"><i class="fab fa-apple"></i> Download</button>
<button type="button" class="btn btn-lg btn-light"><i class="fab fa-google-play"></i> Download</button>
</div>
<div class="col-lg-6">
<img class="title-image" src="image.jpg" alt="classroom-image">
</div>
</div>
</div>
</section>
Demo
If you also want to remove left/right space from the content area, use p-0 on the container, and g-0 (no-gutters) on the row (otherwise you'll get undesired horizontal scrolling).
Also see: Make a bootstrap 4 container-fluid go full bleed to edge of browser window

In this case, it might be best to just use !important. Or, if you really don't want to, you can make the selector more specific (and thus more "important" that the bootstrap one) by prepending body to it. For example:
body .container-fluid {
padding: 0;
}
.title-image {
width:100%;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Python Bootcamp Web Page</title>
<link rel="stylesheet" href="styles.css">
<!-- Font Awesome CDN -->
<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>
<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
<!-- JavaScript Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>
</head>
<body>
<section >
<div class="container-fluid">
<!--all of element appeared when i wrote navbar-expand-lg-->
<nav class="navbar navbar-expand-lg navbar-light bg-info">
<a class="navbar-brand" href="#">
<i class="fab fa-python"> Python Bootcamp</i>
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav ms-auto">
<li class="nav-item">
<a class="nav-link" href="#">Courses</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">How We Work</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Outcomes</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
<!-- Title -->
<div class="row g-0">
<div class="col-lg-6"> <!-- so it will fill 50% of width on screen of laptops, and bigger screens-->
<h1>Download the best bootcamp, and start to study now.</h1>
<button type="button" class="btn btn-lg btn-danger"><i class="fab fa-apple"></i> Download</button>
<button type="button" class="btn btn-lg btn-light"><i class="fab fa-google-play"></i> Download</button>
</div>
<div class="col-lg-6">
<img class="title-image" src="image.jpg" alt="classroom-image">
</div>
</div>
</section>
</body>
</html>
Note that to prevent horizontal scrolling, I also had to add a .g-0 class to the .row element.

How to move navbar toggle button and logo to the left in Bootstrap?

I wanted to ask how can navbar toggle button and logo be moved to the left side of page in Bootstrap.

Place your toggle button tag before logo anchor tag plus add "mr-auto" class to your logo anchor tag. Check it here.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand mr-auto" href="#">Navbar</a>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>
For more you can see bootstrap 4 about margins and paddings Spacing .

Bootstrap 4.3 navbar dropdown list and hamburger menu not working

I copied the navbar code from the bootstrap website but the dropdown list and hamburger menu is not working.I have tried adding popper.js and meta tags to the code as referred in some stackoverflow answers, but it did not work.
It's an ejs file
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Social media</title>
<script
src="https://code.jquery.com/jquery-3.4.1.min.js"
integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
crossorigin="anonymous">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous">
</script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="/stylesheets/main.css">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.0/css/all.css" integrity="sha384-lZN37f5QGtY3VHgisS14W3ExzMWZxybE1SJSEsQp9S+oqd12jhcu+A56Ebc1zFSJ" crossorigin="anonymous">
<script src="/scripts/index.js"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</div>
</nav>
```

Bootstrap.js was missing... it works with that now... added: <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
working snippet below:
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous">
</script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="/stylesheets/main.css">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.0/css/all.css" integrity="sha384-lZN37f5QGtY3VHgisS14W3ExzMWZxybE1SJSEsQp9S+oqd12jhcu+A56Ebc1zFSJ" crossorigin="anonymous">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="/scripts/index.js"></script>
<nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</div>
</nav>

You forget to add bootstrap.min.js file, just add the file and done.
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

You need to add bootstarp.min.js for working with bootstrap.
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

Resources