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    <p>For <code>margin-left:auto;</code> and <code>margin-right:auto;</code> to work, the element needs to have a width. So try something like:</p> <pre><code>margin-left: auto; margin-right: auto; width: 600px; </code></pre> <p><strong>UPDATE:</strong></p> <p>Since you seem to alter your examples all the time, here is a very basic understanding of how <code>display</code> and <code>margins</code> work:</p> <p>To have any box centered within another box, you need to do two things:</p> <p>a) Give the outer box a width (otherwise the inner box doesn't know what to center against</p> <p>b) The inner box needs to have <code>margin: 0 auto</code> (this is the same as <code>margin-left: auto; margin-right: auto;</code>)</p> <p>Also, both boxes need to be block level elements (i.e. have <code>display: block</code>, NOT <code>display: inline;</code>)</p> <p>So put together it will look like this:</p> <p>HTML:</p> <pre><code>&lt;section id="outer"&gt; &lt;section id="inner"&gt;&lt;/section&gt; &lt;/section&gt; </code></pre> <p>CSS:</p> <pre><code>#outer { width: 600px; display: block; border: 1px solid red; } #inner { margin-left: auto; margin-right: auto; width: 200px; height: 200px; border: 1px solid green; } </code></pre> <p>This will give you a green box of 200px by 200px centered within a red box of width 600px.</p> <p>Now, if you want two elements side by side within the green box, you can add your inline elements there, i.e.</p> <pre><code>&lt;section id="outer"&gt; &lt;section id="inner"&gt; &lt;article&gt;Hi&lt;/article&gt; &lt;article&gt;Hi agian!&lt;/article&gt; &lt;/section&gt; &lt;/section&gt; #outer { width: 600px; display: block; border: 1px solid red; } #inner { margin-left: auto; margin-right: auto; width: 200px; height: 200px; border: 1px solid green; } #inner article { display: inline; } </code></pre>
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    1. COI tried it [here](http://jsfiddle.net/ahmadalli/2sagZ/3/) but it didn't work!
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    2. COOf course your example won't work... first off, you gave your `.tc` elements `display:inline;`. Inline elements can't be centered. Secondly, you don't have a width on the outer container. If the outer container doesn't have a width, it doesn't make sense to center something inside. Take a look at this example to see it work: http://jsfiddle.net/2sagZ/14/
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    3. COI want the elements in one line. I asked the question [here](http://stackoverflow.com/questions/14756204/why-marginauto-doesnt-work).
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