<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>模糊</title>
<style>
#div1 {height:50px;line-height:50px;text-align:center;background:#ccc;}
#div1 span{font-size:30px;color:rgba(0,0,0,0);text-shadow:0 0 0 #000;
transition:1s all ease;}
#div1:hover span{text-shadow:0 0 10px #000;}
</style>
</head>
<body>
<div id="div1">
<span>xyphf</span>
</div>
</body>
</html>
