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margin-top: -14px;
border:10px solid #fff;
border-color: transparent transparent transparent #9fc8f7;
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<hgrounp class="white">
<h1>CSS3制作Twitter信息框</h1>
<h2>作者：藤藤(如有更好建议或疑问请加群：1041263)<h2>
</hgrounp>
</header>
<section class="demo">
<div class="box">
<ul class="menu">
<li><i>Share it!</i></li>
<li>WHAT ARE YOU DOING?</li>
<li>@SPICYEPPER</li>
<li>DIRECT MESSAGES</li>
</ul>
<dl class="list">
<dt><img alt="" src="data:image/jpeg;base64,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" /></dt>
<dd>I’m about to jump off a building.</dd>
</dl>
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