Bootstrap Container Centering - css

Question

My form is not centered on my page. See below my html file and the output. How do I center my view?
Herewith my html:
<div class="container">
<div class='row justify-content-center'>
<div class='col'>
<p></p>
<h1>Member Details: </h1>
<p>Name: JP</p>
<p>Surname: Roux</p>
<p>ID Nr: 7604195133089</p>
<p>Mobile Nr: 0741115552</p>
<p>Email: jp#test.com</p>
<p>D.O.B: 1976-04-19</p>
<p>Language: Afrikaans</p>
<p>Interests:
<ul>
<li>Tennis</li>
<li>Squash</li>
</ul>
</p>
<p>Created At: 2018-06-06 09:31:31</p>
<div class="page-header">
Edit
</div>
</div>
</div>

Answer 1

You can put your form like below:
<div class="container">
<div class='row justify-content-center'>
<div class='col-6 border border-primary'>
<form action="/action_page.php">
First name:<br>
<input type="text" name="firstname" value="Mickey">
<br> Last name:<br>
<input type="text" name="lastname" value="Mouse">
<br><br>
<input type="submit" value="Submit">
</form>
</div>
</div>
</div>
jsfiddle.

Answer 2

Never use justify-content-center for the row. If you want to align center content of a column , use d-flex and justify-content-center for the column and wrap its content with a w-auto div.
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.1/css/bootstrap.css" rel="stylesheet"/>
<div class="container">
<div class='row'>
<div class='col d-flex justify-content-center'>
<div class="w-auto">
<p></p>
<h1>Member Details: </h1>
<p>Name: JP</p>
<p>Surname: Roux</p>
<p>ID Nr: 7604195133089</p>
<p>Mobile Nr: 0741115552</p>
<p>Email: jp#test.com</p>
<p>D.O.B: 1976-04-19</p>
<p>Language: Afrikaans</p>
<p>Interests:
<ul>
<li>Tennis</li>
<li>Squash</li>
</ul>
</p>
<p>Created At: 2018-06-06 09:31:31</p>
<div class="page-header">
Edit
</div>
</div>
</div>
</div>
https://codepen.io/anon/pen/eKBNKY
Centered form
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.1/css/bootstrap.css" rel="stylesheet"/>
<div class="container">
<div class='row'>
<div class='col d-flex justify-content-center'>
<form class="w-auto">
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
<small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
</div>
<div class="form-group">
<label for="exampleInputPassword1">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
</div>
<div class="form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">Check me out</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</div>
https://codepen.io/anon/pen/rKWVqV
Using w-auto is unnecessary. If you wish, you can omit.