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copied!<p>Wow, this problem is popular. It's based on a misunderstanding in the <code>vertical-align</code> property. This excellent article explains it:</p> <p><a href="http://phrogz.net/CSS/vertical-align/index.html" rel="noreferrer">Understanding <code>vertical-align</code>, or "How (Not) To Vertically Center Content"</a> by Gavin Kistner.</p> <p><strong><a href="http://howtocenterincss.com/" rel="noreferrer">“How to center in CSS”</a></strong> is a great web tool which helps to find the necessary CSS centering attributes for different situations.</p> <hr> <p>In a nutshell <sub><sup>(and to prevent link rot)</sup></sub>:</p> <ul> <li><strong>Inline elements</strong> (and <em>only</em> inline elements) can be vertically aligned in their context via <code>vertical-align: middle</code>. However, the “context” isn’t the whole parent container height, it’s the height of the text line they’re in. <a href="http://jsfiddle.net/jBthq/" rel="noreferrer">jsfiddle example</a></li> <li>For block elements, vertical alignment is harder and strongly depends on the specific situation: <ul> <li>If the inner element can have a <strong>fixed height</strong>, you can make its position <code>absolute</code> and specify its <code>height</code>, <code>margin-top</code> and <code>top</code> position. <a href="http://jsfiddle.net/YFncP/2/" rel="noreferrer">jsfiddle example</a></li> <li>If the centered element <strong>consists of a single line</strong> <em>and</em> <strong>its parent height is fixed</strong> you can simply set the container’s <code>line-height</code> to fill its height. This method is quite versatile in my experience. <a href="http://jsfiddle.net/d4zGF/" rel="noreferrer">jsfiddle example</a></li> <li>… there are more such special cases.</li> </ul></li> </ul>

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