JSFiddle - React, Tailwind, and code Playground

HTML

<button>Something</button>

CSS

button {
    color:#fff;
    background:#000;
    border: none;
    outline:none;
    padding: 5px;
    cursor: pointer;
    height: 25px;
}

button:focus:active {
    padding-top: 4px;
    padding-left: 4px;
    padding-right: 6px;
    padding-bottom: 6px;
    color: #ccc;
}