title: Change background on button click, using CSS only?
body: <p>Is it possible to change the background color on <code>button</code> click; of the entire <code>document</code>, using only CSS and HTML5?</p>
  
  <p>(e.g.: <a href="https://stackoverflow.com/questions/14481978/change-the-entire-page-background-when-i-click-on-a-button">it's trivial in JavaScript</a>)</p>