JSFiddle - React, Tailwind, and code Playground

HTML

<a href="">oloasdasdlo</a>

CSS

a{position:relative;}
a:after{
    content:'';
    display:none;
    position:absolute;
    left:50%;
    margin-left:-19px;
    height:20px;
    width:37px;
    background-image:url('http://picsee.net/upload/2014-05-17/8e6253561fd6.png');
}
a:hover:after{
    display:block
}