JSFiddle - React, Tailwind, and code Playground

HTML

<button>test</button>

CSS

button{
    padding:0;
    background:#080;
    color:white;
    border:red solid 1px;
    margin:0;
}

button::-moz-focus-inner{
    border: 1px solid blue;
    padding: 0;
    margin: -1px;
}

/* Now try to zoom me! */