body{
  margin: 0;
  padding: 0;
  background: #e74c3c;
}
.middle{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
}
.mouse{
  width: 100px;
  height: 180px;
  border: 4px solid #333;
  border-radius: 60px;
}
.mouse::before{
  content: "";
  width: 25px;
  height: 25px;
  position: absolute;
  top: 30px;
  background: #333;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 50%;
  opacity: 1;
  animation: mouse 2s infinite;
}
@keyframes mouse {
  from{
    opacity: 1;
    top: 30px;
  }
  to{
    opacity: 0;
    top: 150px;
  }
}