JSFiddle - React, Tailwind, and code Playground

HTML

<div class="faux-border">
    <div class="content">This is my content element with fake border</div>
</div>

CSS

.faux-border {
    margin: 20px;
    background: #f00;
    padding: 1px 25%;
}
.content {
    background: #fff;
}