.back-to-top {
    position: fixed;
    bottom: 0em;
    right: 0px;
    padding: 0em;
    display: none;
    -webkit-border-radius: 0.8em;
    -moz-border-radius: 0.8em;
    border-radius: 0.8em;
}
.back-to-top { position: fixed; bottom: 9em; right: 10px; text-decoration: none; color: #000000; background-color: rgba(156, 156, 156, 0.30); font-size: 12px; padding: 0.5em; display: none;}
.back-to-top:hover { background-color: rgba(156, 156, 156, 0.20);}