css3如何实现光点随着指定位置跑

如何利用css3实现光点随着指定位置跑，下面web建站小编给大家简单介绍一下具体实现代码！

1、画一个正方形（在正方形跑圈）

<div class="box run">光点跑动~</div>

2、css3代码

.box {
  height: 500px;
  width: 400px;
  box-shadow: 0 0 2px orange;
  text-align: center;
  line-height: 260px;
}
  
.run {
  background-image: linear-gradient(90deg, rgba(196, 233, 64, 0) 0%, rgb(62, 224, 84) 100%), linear-gradient(0deg, rgb(62, 224, 84) 0%, rgba(196, 233, 64, 0) 100%), linear-gradient(-90deg, rgba(196, 233, 64, 0) 0%, rgb(62, 224, 84) 100%), linear-gradient(0deg, rgba(196, 233, 64, 0) 0%, rgb(62, 224, 84) 100%);
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
  background-size: 100px 4px, 4px 100px, 100px 4px, 4px 100px;
  background-position: -100px 1px, calc(100% - 1px) -100px, calc(100% + 100px) calc(100% - 1px), 1px 0px;
  animation: moveLine 8s infinite linear;
  height: calc(100% - 2px);
  padding: 1px;
  background-clip: content-box;
}
  
@keyframes moveLine {
  0% {
	background-position: -100px 1px, calc(100% - 1px) -100px, calc(100% + 100px) calc(100% - 1px), 1px 0px;
  }
  5% {
	background-position: 0px 1px, calc(100% - 1px) -100px, calc(100% + 100px) calc(100% - 1px), 1px -100px;
  }
  30% {
	background-position: 100% 1px, calc(100% - 1px) -100px, calc(100% + 100px) calc(100% - 1px), 1px -100px;
  }
  35% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) 0px, calc(100% + 100px) calc(100% - 1px), 1px -100px;
  }
  50% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) 100%, calc(100% + 100px) calc(100% - 1px), -100px -100px;
  }
  55% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) calc(100% + 100px), 100% calc(100% - 1px), -100px calc(100% + 100px);
  }
  80% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) calc(100% + 100px), 0px calc(100% - 1px), 1px calc(100% + 100px);
  }
  85% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) calc(100% + 100px), -100px calc(100% - 1px), 1px 100%;
  }
  100% {
	background-position: calc(100% + 100px) 1px, calc(100% - 1px) calc(100% + 100px), -100px calc(100% - 1px), 1px 0px;
  }
}

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