JSFiddle - React, Tailwind, and code Playground

HTML

<div class="item_btn_4">
    <a href="unidad_4.html">
    <div class="titulo_btn_4">Unidad 4</div>
</a></div>

CSS

.item_btn_4 a{
    background-color: #F9A63E;
    background-repeat: no-repeat;
    background-position: center center;
    width: 80px;
    height: 80px;
    position: absolute;
    opacity: 100;
    -webkit-border-radius: 100px;
    -moz-border-radius: 100px;
    -o-border-radius: 100px;
    border-radius: 100px;
    margin: 88px;
    float: left;
    }
 
.item_btn_4 a:hover {
    background-color: #FBBD71;
    }
 
 
.titulo_btn_4{
    font-family: Arial;
    color: #FFF;
    background-color: #F9A63E;
    text-align: center;
    width: 225px;
    margin-top: 85px;
    margin-left: -160px;
    position: absolute;
    z-index: -9999;
    opacity: 0;
    box-shadow: 0px 3px 5px rgba(0, 0, 0, 0.5);
    -webkit-border-radius: 100px;
    -moz-border-radius: 100px;
    -o-border-radius: 100px;
    border-radius: 100px;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    -ms-transition: all 1s;
    transition: all 1s;
    }