vertical center bootstrap

1<div class="d-flex align-items-start">...</div>
2<div class="d-flex align-items-end">...</div>
3<div class="d-flex align-items-center">...</div>
4<div class="d-flex align-items-baseline">...</div>
5<div class="d-flex align-items-stretch">...</div>

1<div class="row align-items-center justify-content-center">
2    <div class="col">This will be centered vertically and horizontally</div>
3</div>
4

1<span class="align-baseline">baseline</span>
2<span class="align-top">top</span>
3<span class="align-middle">middle</span>
4<span class="align-bottom">bottom</span>
5<span class="align-text-top">text-top</span>
6<span class="align-text-bottom">text-bottom</span>

1<div class=”row”>
2	<div class=”col-6 align-self-center”>
3    	<div class=”card card-block”>
4    		Center
5        </div>
6    </div>
7</div>

1<!-- Center columns in a Row -->
2<div class="row d-flex justify-content-center text-center">
3    <div class="col-4">
4        // Add Content
5    </div>
6    <div class="col-4">
7        // Add Content
8    </div>
9    <div class="col-4">
10        // Add Content
11    </div>
12</div>

1<div class="container h-100">
2    <div class="row align-items-center h-100">
3        <div class="col-6 mx-auto">
4            <div class="jumbotron">
5                I'm vertically centered
6            </div>
7        </div>
8    </div>
9</div>
10