.top-button {
  position: fixed;
  right: 0.625rem;
  bottom: 0.625rem;
  z-index: 4;

  display: none;
  width: 40px;
  height: 40px;

  background-color: var(--white);
  border-radius: 50%;
  cursor: pointer;
}

.top-button img {
  width: 100%;
  height: 100%;
}