#scrollToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  z-index: 9999;
  background-color: #000;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 10px 14px;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  transition: opacity 0.3s ease;
  width:38px;
  height:38px;
  align-items: center;
  justify-content: center;
}
#scrollToTop:hover {
  background-color: #333;
}