css has no effect in my Masterpage
<p>I have a Masterpage and I want to bind a part of this master page to a *.css file but no success.this is my Masterpage code:</p>

<pre><code>&lt;head runat="server" &gt;
    &lt;title&gt;&lt;/title&gt;
    &lt;link href="~/Styles/Test.css" rel="stylesheet" type="text/css" /&gt;
    &lt;asp:ContentPlaceHolder ID="HeadContent" runat="server" &gt; 
    &lt;/asp:ContentPlaceHolder&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;form runat=server&gt;
&lt;body&gt;
   &lt;table width=100% border=1&gt;
    &lt;tr width=100%&gt;
      &lt;td &gt;&lt;/td&gt;
      &lt;div class=mainbody&gt;
      &lt;td width=80%  align=center&gt;
       &lt;asp:ContentPlaceHolder ID="MainContent" runat="server"&gt;&lt;/asp:ContentPlaceHolder&gt;
      &lt;/td&gt;
      &lt;/div&gt;
      &lt;td &gt;&lt;/td&gt;
    &lt;/tr&gt;
   &lt;/table&gt;
  &lt;/body&gt;
&lt;/form&gt;

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

<p>and in my css file I have:</p>

<pre><code>body
{

}
mainbody
{
  background-color:#a0ccff 
}
</code></pre>

<p>coild you please tell me,why it doesn't work?</p>
