JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo"></div>
<div id="bar"></div>

CSS

#foo {
    border: 1px solid red;
    border-bottom-width: 10px;
}

#bar {
    border-bottom-width: 10px;
    border: 1px solid red;
}

div {
    display: inline-block;
    width: 50px;
    height: 50px;
    margin: 20px;
}