CSS控制段落首字母放大显示

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CSS:
#content p { font: 80%/1.6 Verdana, Geneva, Arial, Helvetica, sans-serif;}
#content p:first-letter { font-size: 2em; padding: 0.1em; color: #000000; vertical-align: middle;}
#content p:first-line { color: #191970;}
#content p:first-child { margin-left: 2em;}
#content p:first-child:first-line { color: inherit;}
DIV:
<div id="content">
<p>Welcome to http://wh.ac.cn</p>
<p>This is a bike.</p>
</div>