.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #000;
  width: 40px;
  height: 40px;
  text-align: center;
  border-radius: 50%;
  display: none; /* Initially hidden, will be flex when shown */
  cursor: pointer;
  text-decoration: none;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.back-to-top-icon {
  color: #fff;
  font-size: 24px;
}