.back-to-top {
  cursor: pointer;
  position: fixed;
  bottom: 2rem;
  right: 2.5rem;
  width: 2rem;
  height: 1.2rem;
  background-color: var(--back-to-top-color);
  mask: url('back-to-top.svg') no-repeat;
  z-index: var(--back-to-top-z-index);
}

.back-to-top:hover {
  background-color: var(--back-to-top-color-hover);
}

@media (max-width: 959px) {
  .back-to-top {
    display: none;
  }
}

.back-to-top-enter-active,
.back-to-top-leave-active {
  transition: opacity 0.3s;
}

.back-to-top-enter-from,
.back-to-top-leave-to {
  opacity: 0;
}