JSFiddle - React, Tailwind, and code Playground

HTML

<div class="styled"></div>
<button class="styled"></button>

CSS

.styled {
    border: 4px solid black;
    background: blue;
    width: 100px;
    height: 100px;
}

button.styled {
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box;
    box-sizing: content-box;
    padding: 0;
}