JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="inner">Hello</div>
    <div class="inner">Peace</div>
</div>

CSS

.wrapper {
    background-color: #000;
    min-height: 100px;
}
.inner {
    display: inline-block;
    background-color: #777;
    height: 100%;
}