JSFiddle - React, Tailwind, and code Playground

by cahnory

HTML

<span class="test">a</span> <span class="test2">b</span>

CSS

.test {
    border: 1px solid transparent;
    border-bottom-color: #F00;
}
.test2 {
    border: 1px solid #F00;
    border-bottom-color: transparent;
}