title: why my CSS did not set the color of div border successfully?
body: <p>I have a <code>div</code> in my html page which holds 3 radio buttons:</p>
  
  <pre><code>&lt;html&gt; 
  &lt;head&gt;
     &lt;link href="CSS/mystyle.css" rel="stylesheet" type="text/css" media="screen" /&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;div id="outside"&gt;
  
         &lt;div id="inside"&gt;
          &lt;input type="radio"&gt; apple
          &lt;input type="radio"&gt; orange
          &lt;input type="radio"&gt; banana
         &lt;/div&gt;
  
         &lt;div id="others"&gt;&lt;/div&gt;
  
      &lt;/div&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>My CSS is located under CSS directory, </p>
  
  <p><strong>CSS/mystyle.css</strong>:</p>
  
  <pre><code>#inside{
  
      font-size:12px;     
      border-color:#ff3366;
      width: 300px;
      height: 50px;
  }
  </code></pre>
  
  <p>The <code>width</code>, <code>height</code> and <code>font-size</code> are set successfully, but the <code>border-color:#ff3366;</code> does not shows, why? Why I am failed to set the border color for the div ?</p>
  
  <p>-------------------- MORE ---------------------</p>
  
  <p>By the way, how to locate my inner div (with id="inside") to the right hand side of the outside div, with about 100px margin to the right most border of outside div?</p>