#backtotop {
  position: fixed;
  top: 80%;
  width: 50px;
  height: 50px;
  z-index: 9999;
  right: 15px;
  padding-top: 0;
  display: none;
}
#backtotop div {
  cursor: pointer;
  background-size: 25px 25px !important;
  right: 10px;
  text-decoration: none;
  background-position: 13px 7px !important;
  padding-top: 5px;
}
#backtotop span {
  font-size: 12px;
  padding-top: 30px;
  display: inline-block;
  text-align: center;
  width: 100%;
}