#back-to-top {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 25px;
  z-index: 99;
  border: none;
  outline: none;
  color: white;
  cursor: pointer;
  font-size: 18px;
  transition: transform 0.3s ease;
}

#back-to-top:hover {
  transform: scale(1.2);
}

#back-to-top img {
  width: 38px;
  height: 37px;
}