#button,#button:active,#button:hover{background-color:var(--amarillo)}#button{display:inline-block;width:50px;height:50px;text-align:center;border-radius:4px;position:fixed;bottom:20px;right:8px;-webkit-transition:background-color .3s,opacity .5s,visibility .5s;transition:background-color .3s,opacity .5s,visibility .5s;opacity:0;visibility:hidden;z-index:1000}#button:after{content:"\f106";font-family:FontAwesome;font-weight:700;font-style:normal;font-size:2em;line-height:50px;color:#333}#button:hover{cursor:pointer}#button.show{opacity:1;visibility:visible}