How to add opacity to a div?
<p>I am trying to add opacity to a div.</p>

<p>Here is my Jquery:</p>

<pre><code>$('.redDiv').fadeIn(0, 0.5);
</code></pre>

<p>My HTML:</p>

<pre><code>&lt;div class="redDiv" style="background:red;width:20px;height:20px;"&gt; &lt;/div&gt;
&lt;div class="divBlue;" style="background:blue;width:20px;height:20px;"&gt; &lt;/div&gt;
&lt;div class="divBlack;" style="background:black;width:20px;height:20px;"&gt; &lt;/div&gt;
</code></pre>
