Untitled

Css代码
```<style type="text/css">
    p{ font-size: 30px; }
    p.c{ text-decoration: underline; }
    .c{ color: blue;}
</style>
</head>
<body>
<p id="p1">p1</p>
<p id="p2">p2</p>
<p id="p3" class="c">p3</p>
<h1 id="h1" class="c">h1</h1>
<h2 id="h2">h2</h2>
<div id="d1">d1</div>
</body>```