.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  text-decoration: none;
  color: #eee;
  background-color: rgba(0, 0, 0, 0.3);
  font-size: 12px;
  padding: 9px 12px;
  border-radius: 5px;
  display: none;
}
.back-to-top i {font-size: 2em;}
.back-to-top:hover {color: #FFF;background-color: #272930;}
.back-to-top:focus {color: #FFF;}