JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child"></div>
</div>

CSS

.parent {
    height: 200px;
    background: #eee;
    display: table-cell;
    width: 300px;
    vertical-align: bottom;
}

.child {
    height: 20px;
    background: #aaa;
}