#return-to-top {
  position:fixed;
  bottom:20px;
  right:20px;
  background:rgb(0, 0, 0);
  background:rgba(0, 0, 0, 0.7);
  width:50px;
  height:50px;
  display:block;
  text-decoration:none;
  -webkit-border-radius:35px;
  -moz-border-radius:35px;
  border-radius:35px;
  display:none;
  -webkit-transition:all 0.3s linear;
  -moz-transition:all 0.3s ease;
  -ms-transition:all 0.3s ease;
  -o-transition:all 0.3s ease;
  transition:all 0.3s ease;
}

#return-to-top i {
  color:#fff;
  margin:0;
  position:relative;
  left:16px;
  top:13px;
  font-size:19px;
  -webkit-transition:all 0.3s ease;
  -moz-transition:all 0.3s ease;
  -ms-transition:all 0.3s ease;
  -o-transition:all 0.3s ease;
  transition:all 0.3s ease;
}

#return-to-top:hover {
  background:rgba(0, 0, 0, 0.9);
}

#return-to-top:hover i {
  color:#fff;
  top:5px;
}