- https://medium.com/wdstack/bootstrap-4-vertical-center-1211448a2eff
- h-100 - makes height 100%
- my-auto - vertical align
- Body needs to be 100% too (otherwise 100% of inner container)
<div class="row h-100">
<div class="col-sm-12 my-auto">
<div class="card card-block w-25">Card</div>
</div>
</div>- requires
html, body, #root, #root>div {
height: 100% !important;
}