Set width of Bootstrap 4 navbar overlay to nav contents - css

Question

I would like to set the width of the Bootstrap 4 navbar overlay, when it is shown by clicking on the hamburger icon, to match its contents, rather than take up the whole screen. I've looked through the navbar, navbar-collapse, and navbar-nav classes, some flex documentation, and I'm not yet clear how to do this.

Answer 1

You could utilize the fact that the navbar-toggler can also handle things outside the navbar.
So, you'd create a container outside the navbar, put a row inside and a col-auto into that row.
Putting the entire collapse navbar-collapse div into that auto-column will now do exactly what you desire. The only disadvantage is that for the expanded state of the navbar, you'd have to have a duplicate of the navbar-item list inside the navbar.
Also note that you need to add style="margin-top: -1px !important" to external container because otherwise it will stick out by one pixel. (m-0 removes the regular margin on the container)
Here's a working code snippet (click "run code snippet" below):
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<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>
<nav class="navbar navbar-expand-DISABLED navbar-dark bg-dark">
<a class="navbar-brand" href="#">
<img class="brand-icon mr-2" src="https://placehold.it/60" width="30" height="30" alt="">Company
</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>
</nav>
<div class="container m-0" style="margin-top: -1px !important">
<div class="row">
<div class="col-auto navbar-dark bg-dark">
<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>
</div>
</div>
</div>
</div>