bootstrap vertical align

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<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="jumbotron d-flex align-items-center min-vh-100">
2  <div class="container text-center">
3    I am centered vertically
4  </div>
5</div>
6

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

1<span class="align-baseline">baseline</span><span class="align-top">top</span><span class="align-middle">middle</span><span class="align-bottom">bottom</span><span class="align-text-top">text-top</span><span class="align-text-bottom">text-bottom</span>

1<div class="row h-100">   <div class="col-sm-12 my-auto">     <div class="card card-block w-25">Card</div>   </div></div>