JSFiddle - React, Tailwind, and code Playground

by HDL52

HTML

<h2 class="title">
    <span>
      你会发现CSS是你永远学不会的语言
    </span>
  </h2>

CSS

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.title {
  color: #333;
  line-height: 2;
  width: 550px;
  font-size: 64px;
}

.title span {
  background: linear-gradient(to right, black, black) no-repeat right bottom;
  background-size: 0px 5px;
  transition: background-size 1200ms;
}

.title span:hover {
  background-position-x: left;
  background-size: 100% 5px;
}