<div class="cursor27">
  <span class="ani-box27"></span>
</div>

.cursor27{
  width: 40px;
  height: 60px;
  border: 3px solid #333333;
  border-radius: 20px;
  box-sizing: border-box;
  position: relative;
}
.ani-box27{
  width: 6px;
  height: 14px;
  display: block;
  position: absolute;
  top: 6px;
  left: 14px;
  background-color: #333333;
  border-radius: 3px;
  animation: moveeff27 2s ease-in-out infinite;
}
@keyframes moveeff27{
  0%{
    top: 6px;
  }
  50%{
    top: 16px;
  }
  100%{
    top: 6px;
  }
}