I am using bootstrap's jumbotron and have the the following:
<div class="container">
<div class="row">
<div class="jumbotron">
<h1 class="display-4">Hello, world!</h1>
<p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>
<hr class="my-4">
<p>It uses utility classes for typography and spacing to space content out within the larger container.</p>
<p class="lead">
<a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>
</p>
</div>
</div>
</div>
Now this code gets the following:
I want to now centre the jumbotron to the centre of the screen, I know I can add mt class to jumbotron but that doesn't get me to exact centre