JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" value="submit" />
<input id="btn1" type="button" value="submit" />

CSS

input {
    padding: 3px;
    border: 1px solid #c0c0c0;
    background: #e5e5e5;
    color: #246;
    margin: 1px 2px;
    width: auto;
}


#btn1::-moz-focus-inner {
    padding:0;
    border:0;
}