JSFiddle - React, Tailwind, and code Playground

by 3rror404

HTML

<button class="btn">Button</button>

CSS

.btn {
    text-transform: uppercase;
    font-weight: 600;
    text-decoration: none;
    padding: 8px 18px;
    display: inline-block;
    border: none;
    border-radius: 5px;
    transition: all 0.2s;
    position: relative;
}

.btn::after {
    content: "";
    display: inline-block;
    height: 100%;
    width: 100%;
    border-radius: 10rem;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    background: red;
}

.btn:hover::after {
    transform: scale(2);
}