JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flex">
	<div class="block"></div>
	<div class="block"></div>
</div>

CSS

body { background-color: #232323; }

.flex {
	width: calc(100% - 20px);
	display: flex;
	background-color: #616161;
	padding: 10px;
}

.block {
	height: 100px;
	flex-basis: 50%;
	background-color: lightpink;
	margin: 10px;
}