CSS鼠标移入移出过渡效果，HTML/Vue代码在线实时编辑、预览

            
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            h1 {
  position: relative;
  font-size: 4em;
}

h1::before {  
  transform: scaleX(0);
  transform-origin: bottom right;
}

h1:hover::before {
  transform: scaleX(1);
  transform-origin: bottom left;
}

h1::before {
  content: " ";
  display: block;
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  inset: 0 0 0 0;
  background: #FF69B4;
  z-index: -1;
  transition: transform .25s ease;
}


body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffe;
}