.back-to-ceiling {
  position: fixed;
  display: inline-block;
  text-align: center;
  cursor: pointer;
  right: 50px;
  bottom: 50px;
  width: 40px;
  height: 40px;
  border-radius:4px;
  line-height: 45px;
  background: #e7eaf1;
  opacity: 0;
  z-index: 200;
}
.back-to-ceiling:hover {
  background: #d5dbe7;
}

.Icon {
  fill: #9aaabf;
  background: none;
}