JSFiddle - React, Tailwind, and code Playground

HTML

<a class="sin_contenido" href="#"></a>
<a class="con_contenido" href="#">Hola!</a>

CSS

.sin_contenido {
    background: url(http://www.epi-centre.com/basics/pixels/images/pixels5.jpg);
    height: 100px;
    width: 100px;
    display: block;
}
.con_contenido {
    background: url(http://www.epi-centre.com/basics/pixels/images/pixels5.jpg);
}