.back-to-top {
  color: black;
  position: fixed;
  z-index: 999;
  bottom: 2rem;
  left: 1rem;
  display: none;
}

.back-to-top:active,
.back-to-top:focus,
.back-to-top:hover {
  text-decoration: none;
  color: #afb3b0;
}

.back-to-top i {
  font-size: 3em;
}