JSFiddle - React, Tailwind, and code Playground

HTML

<button>Button</button>

CSS

button {
    padding: 8px 25px;
    font: bold 0.8em/1.2 Arial, sans-serif;
    color: #fff;
    background: linear-gradient(to bottom, #5A5A5A 0%, #454545 50%, #191919 50%, #030303 100%);
    border: none;
    border-radius: 5px;
}