#scrollTopBtn {
  position: fixed;
  bottom: 100px;
  right: 10px;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  z-index: 1000;

  /* Hidden by default, animated show/hide */
  opacity: 0;
  pointer-events: none;
  transform: translateX(50px);
  transition: opacity 0.3s, transform 0.3s;
}
#scrollTopBtn.show {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}
#scrollTopBtn.hide {
  opacity: 0;
  transform: translateX(50px);
  pointer-events: none;
}
#scrollTopBtn svg {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: block;
}
#scrollTopBtn:hover path {
  stroke: #333;
}