nth-child - second img of a div
<p>I have two images inside of a div</p>

<pre><code>&lt;div class="my_div"&gt;

&lt;img src="1.jpg" /&gt;
&lt;img src="2.jpg" /&gt;

&lt;/div&gt;
</code></pre>

<p>I have tried following css</p>

<pre><code>.my_div img:nth-child(2) { margin-top:130px; }
</code></pre>

<p>But this doesn't work? Any idea why?</p>