title: How to change the CSS of entire page/website on click?
body: <p>Is it possible to have 3-4 CSS on a page, and then on any event, say click, change the css for entire webpage. This way we can give our user the ability to change the theme. I know we can change the css of an element by:  </p>
  
  <pre><code>$("#myElementID").removeClass("class1").addClass("class2");
  </code></pre>