#ScrollUpToTop {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 50px;
  height: 50px;
  z-index: 1000;
  border: none;
  border-radius: 5px;
  background: rgba(0,0,0, 0.4);
  color: #FFF;
  font-size: 40px;
  text-align: center;
  padding-top: 10px;
}

#ScrollUpToTop:hover { background: rgba(0,0,0,0.7); }