眼馋好几天,今天有点时间去大佬网站给扒过来了

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本页面也有几个,就是鼠标放在hr线上剪刀就会运动,本以为是js做的,没想到就只是一个before和hover

hr {
  position: relative;
  margin: 2rem auto;
  width: calc(100% - 4px);
  border: 2px dashed #a4d8fa;
  background: #fff;
}
hr {
    box-sizing: content-box;
    height: 0;
    overflow: visible
}
hr:hover:before {
  left: calc(95% - 20px);
}
hr:before {
  position: absolute;
  top: -10px;
  left: 5%;
  z-index: 1;
  color: #49b1f5;
  content: '\f0c4';
  font: normal normal normal 14px/1 FontAwesome;
  font-size: 20px;
  -webkit-transition: all 1s ease-in-out;
  -moz-transition: all 1s ease-in-out;
  -o-transition: all 1s ease-in-out;
  -ms-transition: all 1s ease-in-out;
  transition: all 1s ease-in-out;
}