JSFiddle - React, Tailwind, and code Playground

HTML

<div class="p1">
    <div class="child">Child 1</div>
    Parent 1
</div>
<div class="p2">
    <div class="child">Child 2</div>
    Parent 2
</div>

CSS

html, body {height: 100%}

.p1 {
    width: 50%;
    height: 100%;
    float: left;
    background-color: cyan;
}

.p2 {
    width: 50%;
    min-height: 100%;
    float: left;
    background-color: green;
}

.child {
    width: 50%;
    height: 100%;
    background-color: yellow;
    float: right;
}