JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.block {
    height: 100px;
    width: 100px;
    background: red;
    padding: 0 20px;
}
.block__inner {
    height: 20px;
    background: blue;
    margin:0 -20px;
}