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height: 40px;
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background: pink;
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<body>
<div class="nav">
<ul>
<li>
<a href="###">男星</a>
<ul>
<li><a href="###">王宝强</a></li>
<li><a href="###">陈羽凡</a></li>
<li><a href="###">.....</a></li>
</ul>
</li>
<li>
<a href="###">女星</a>
<ul>
<li><a href="###">杨幂</a></li>
<li><a href="###">柳岩</a></li>
<li><a href="###">赵丽颖</a></li>
</ul>
</li>
<li>
<a href="###">导演</a>
<ul>
<li><a href="###">冯小刚</a></li>
<li><a href="###">张艺谋</a></li>
<li><a href="###">丁黑</a></li>
</ul>
</li>
</ul>
</div>
</body>
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