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    <p>There are many ways to go ahead about this. </p> <p>I usually hide the sub menu <code>ul</code>s with <code>display: none</code> and take them out of the content flow with <code>position: absolute</code>. Give the <code>li</code> containing the sub menu <code>position: relative</code> so that the sub menus are relative to their direct parents, then position the sub menus however you please using the <code>top</code>, <code>right</code>, <code>bottom</code> and <code>left</code> properties. Finally, change the sub menu to <code>display: block</code> through a <code>:hover</code> or whatever.</p> <p><strong>Here's a bare-bones example of this:</strong></p> <p>Markup:</p> <pre><code>&lt;nav&gt; &lt;ul&gt; &lt;li&gt;&lt;a&gt;Link&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a&gt;Sub link&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a&gt;Sub link&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a&gt;Sub link&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/nav&gt; </code></pre> <p>CSS:</p> <pre><code>nav li { position: relative; } nav li &gt; ul { position: absolute; top: 100%; display: none; } nav li:hover &gt; ul { display: block; } </code></pre> <p><a href="http://codepen.io/Mest/pen/Akeus" rel="nofollow">Here's a pen with this example</a>. It looks like crap but you get the drill.</p> <p>You can just keep nesting more sub-menus, but you'll probably want to use different positioning for second-and-lower-levels of sub menus.</p> <p>However, please note that mobile browsers don't really support <code>:hover</code>. At least they don't treat it the same. You shouldn't make your sub menus accessible only on <code>:hover</code>. Consider adding some sort of class name toggle on click with javascript instead.</p>
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    1. POhow to add sub menus on a responsive css menu
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