.pagetop {
  position: fixed;
  right: 40px;
  bottom: 40px;
  width: 77px;
  height: 103px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transform: translateY(50px);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
  z-index: 1;
}
.pagetop.is-show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
@media (max-width: 1000px) {
  .pagetop {
    position: fixed;
    right: 30px;
    bottom: 20px;
    width: 50px;
    height: 70px;
  }
}