JSFiddle - React, Tailwind, and code Playground

HTML

<a class=btn>Button</a>
<a class="blue btn">Blue Button</a>

CSS

.btn {
    background: red -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0.1)), to(rgba(0, 0, 0, 1)));
    color: #fff;
    padding: 3px 12px;
    display: inline-block;
}

.blue {
    background-color: #00f;
}