title: CSS3 - Transition
body: <p>I have a little problem with CSS.
  I'm following a book to learn CSS3 and I just discovered the function Transition.
  So I decided to make an attempt and I can not figure out where I'm wrong, I hope you can help me.</p>
  
  <p>This is my Index.html file</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;My Test&lt;/title&gt;
      &lt;link rel="stylesheet" type="text/css" href="main.css"&gt;
  &lt;/head&gt;
  &lt;body&gt;
  
  &lt;div class="box"&gt;&lt;/div&gt;
  &lt;div class="ssin"&gt;&lt;/div&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>nothing special ! and this is the main.css</p>
  
  <pre><code>.box{
      height: 200px;
      width: 200px;
      background-color: #333333;
  }
  
  .ssin{
      height: 200px;
      width: 200px;
      background-color: red;
  }
  
  .box:hover .ssin{
      width: 500
  }
  </code></pre>
  
  <p>i think the problem is around here ...</p>
  
  <pre><code>.box:hover .ssin{
      width: 500;
  }
  </code></pre>
  
  <p>If I hove .box nothing happen, theoretically it should change the width of ssin div.</p>
  
  <p>Could you please help me (I know this is stupid, but I'am still learning) </p>
  
  <p>Thank you</p>