JSFiddle - React, Tailwind, and code Playground

HTML

<a class="social facebook" href="#" title="COMPARTIR EN FACEBOOK" onclick="comparte()">COMPARTIR EN FACEBOOK</a>

CSS

.social {
	width: 100%;
	display: inline-block;
	padding: 3px;
	font-size: 21px;
	color: #FFF;
	text-align: center;
	font-family: sans-serif !important;
        text-decoration: none;
}
.facebook {
	background: #2F5DC1;
	float: left;
}