HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>阴影 - 鼠标悬浮时加深阴影</title>
<link rel="stylesheet" href="https://cdn.w3cbus.com/library/mdui/1.0.2/css/mdui.min.css"/>
</head>
<body>
<div class="mdui-container">
<div class="mdui-card mdui-hoverable" style="max-width: 400px;margin-top: 20px;">
<div class="mdui-card-media">
<img src="https://cdn.w3cbus.com/mdui/docs~1/static/1ca4b7b2b4b2f2352aeb.jpg"/>
</div>
<div class="mdui-card-actions">
<button class="mdui-btn mdui-ripple">action 1</button>
<button class="mdui-btn mdui-ripple">action 2</button>
</div>
</div>
</div>
<script src="https://cdn.w3cbus.com/library/mdui/1.0.2/js/mdui.min.js"></script>
</body>
</html>