.back-to-top {
  position: fixed;
  bottom: -60px;
  right: 20px;
  background-color: #3e3c56;
  color: #fff;
  padding: 13px 18px;
  border: none;
  border-radius: 44px;
  cursor: pointer;
  transition: background-color 0.3s, bottom 0.3s;
  z-index: 1;
}

.back-to-top:hover {
  background-color: #4f4d6e;
}