#button{align-items:center;background-color:#59178a;border-radius:4px;bottom:10px;display:flex;height:50px;justify-content:center;left:10px;opacity:0;position:fixed;text-align:center;transition:background-color .3s,opacity .5s,visibility .5s;visibility:hidden;width:50px;z-index:9}#button:hover{background-color:#333;cursor:pointer}#button:active{background-color:#555}#button.show{opacity:1;visibility:visible}a#button svg path{stroke:#fff}