#backToTop {
  display: none;
  position: fixed;
  bottom: 30px;
  right: 30px;
  background-color: 
#f5f5f5;
  color: 
#333;
  border: none;
  border-radius: 25px;
  padding: 10px 15px;
  font-size: 20px;
  box-shadow: 0 2px 6px 
rgba(0,0,0,0.1);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s, background-color 0.2s;
  z-index: 1000;
}

#backToTop:hover {
  opacity: 1;
  background-color: 
#e0e0e0;
}