哪错了，没有效果
<html>
<html>
<head>
<meta charset="UTF-8">
<title>IMOOC</title>
</head>
<body>
<section class="main">
<aside>
<h1>Recent <samp>Course</samp></h1>
<dl>
<dt>Hyper Text Markup Language</dt>
<dd><img src="http://img1.sycdn.imooc.com/climg//582e61290001787900500051.png"></dd>
<dd>HTML is the standard markup language used to create web pages and its elements form the building blocks of all websites.</dd>
</dl>
<dl>
<dt>Cascading Style Sheets</dt>
<dd><img src="http://img1.sycdn.imooc.com/climg//582e61290001787900500051.png"></dd>
<dd>Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g., fonts, colors, spacing) to Web documents.</dd>
</dl>
<dl>
<dt>JavaScript</dt>
<dd><img src="http://img1.sycdn.imooc.com/climg//582e61290001787900500051.png"></dd>
<dd>JavaScript is a high-level, dynamic, untyped, and interpreted programming language.</dd>
</dl>
<dl>
<dt>AngularJS</dt>
<dd><img src="http://img1.sycdn.imooc.com/climg//582e61290001787900500051.png"></dd>
<dd>AngularJS is an open-source web application framework mainly maintained by Google and by a community of individuals and...</dd>
</dl>
</aside>
<article>
<h1>Welcome to <samp>Massive Open Online Course!</samp></h1>
<p>We provide the latest knowledge to help you cope with the changing world!</p>
<img src="http://img1.sycdn.imooc.com/climg//582e61180001ede703300130.jpg">
<p>We hope that all the students who love the Internet can be more convenient access to learning resources, using the Internet thinking to change our learning.</p>
<p>Focus on IT skills education MOOC, consistent with the development trend of the Internet down to earth's MOOC. We are free, we only teach useful, we concentrate on education.</p>
</article>
</section>
</body>
</html>
/* 在此完成CSS样式设置*/
/* main */
.main { position: relative; width: 1200px; height: 473px; margin: 34px auto 0; }
.main h1 { font-size: 30px; font-weight: lighter; margin-bottom: 23px; }
.main h1 > samp { font-size: 30px; color: #7c7c7c; }
.main > aside { float: left; width: 450px; }
.main > aside > dl { position: relative; display: block; height: 74px; margin-bottom: 17px; }
.main > aside > dl > dt { position: absolute; top: -1px; left: 92px; font-size: 16px; font-weight: bold; line-height: 16px; text-decoration: underline; }
.main > aside > dl > dd:first-of-type { position: absolute; left: 0; }
.main > aside > dl > dd:last-of-type { position: absolute; top: 20px; left: 90px; }
.main > article { float: right; width: 720px; overflow: hidden; }
.main > article > p,
.main > article > img { margin-bottom: 20px; }
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