CSS实现中间向两边滑动下划线效果

html代码

<a class="link" href="https://wdja.cn">WDJA网站内容管理系统</a>

css代码

.link::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: #000;
  visibility: hidden;
  -webkit-transform: scaleX(0);
  -moz-transform: scaleX(0);
  -ms-transform: scaleX(0);
  -o-transform: scaleX(0);
  transform: scaleX(0);
  transition-duration: 0.2s;
  transition-timing-function: ease-in-out;
  transition-delay: 0s;
}
.link:hover::before {
  visibility: visible;
  -webkit-transform: scaleX(1);
  -moz-transform: scaleX(1);
  -ms-transform: scaleX(1);
  -o-transform: scaleX(1);
  transform: scaleX(1);
}