.mouse {
  width: 50px;
  height: 90px;
  border: 3px solid #fff;
  border-radius: 60px;
  position: absolute;
  bottom: 2rem;
  right: 0rem;
}

.mouse::before {
  content: "";
  width: 12px;
  height: 12px;
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #eee;
  border-radius: 50%;
  opacity: 1;
  animation: wheel 2s infinite;
  -webkit-animation: wheel 2s infinite;
}

@keyframes wheel {
  to {
    opacity: 0;
    top: 60px;
  }
}