title: how to override css class style
body: <p>I have a problem with Wordpress Theme.
  I'm trying to put sidebar in header.. and because of sidebar class style it receives "colored" backround. if I will change it then all sidebars will have a change. </p>
  
  <p>How I can override that style class only so a change will be only in a place I need it?</p>
  
  <p>part of section in template page.php</p>
  
  <pre><code>&lt;?php display_ca_sidebar( $args ); ?&gt;
  </code></pre>
  
  <p>css section of sidebar</p>
  
  <pre><code>#sidebar ul li{width:298px;float:left; background:url(i/Modern/sidebar.jpg) left top no-repeat #83b1cd;  margin:0 0 19px 0;padding:0 0 10px 0; list-style:none; list-style-type:none;  border:1px solid #536867;}
  </code></pre>
  
  <p>I need to override "background"</p>
  
  <p>Thanks for Help!</p>