<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.button {
display: inline-block;
border-radius: 4px;
background-color: #f4511e;
border: none;
color: #FFFFFF;
text-align: center;
font-size: 28px;
padding: 20px;
width: 200px;
cursor: pointer;
margin: 5px;
}
.button span {
cursor: pointer;
display: inline-block;
position: relative;
transition: 0.5s;
}
.button span:after {
content: '»';
position: absolute;
opacity: 0;
top: 0;
right: -20px;
transition: 0.5s;
}
.button:hover span {
padding-right:30px; // 这一句实现了， button本来的字和新出现的» 一起动。 如果把span 删了， 看起来很不同步
}
.button:hover span:after {
opacity: 1;
right: 0;
}
</style>
</head>
<body>
<h2>按钮动画</h2>
<button class="button" style="vertical-align:right"><span>Hover </span></button>
</body>
</html>
http://www.runoob.com/try/try.php?filename=trycss_buttons_animate1
