JSFiddle - React, Tailwind, and code Playground

HTML

<div class="item_btn_1">
    <a class="titulo_btn_1" href="#">
    Texto...
    </a></div>

CSS

.item_btn_1{
    background-color: #C5D163;
    background-image: url(../images/unidad_1.png);
    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;
    }
 
.item_btn_1 a{
    position: absolute;
    text-decoration: none;
    }
 
.item_btn_1:hover {
    background-color: #D5DE8D;
    }

.titulo_btn_1{
    font-family: Arial;
    color: #000;
    background-color: #C5D163;
    width: 225px;
    margin-top:-50px;
    margin-left: -70px;
    position: absolute;
    z-index: -9999;
    opacity: 0;
    box-shadow: 0px 3px 5px rgba(0, 0, 0, 0.5);
    text-align: center;
    -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;
    float: left;
    }