title: Have only one image for the whole backgroung / style
body: <p>I am new and I try to learn on how to use <code>html</code> and <code>css</code>.</p>
  
  <p>I know that it is possible to have the whole style of a page (example background image, help buttons etc. ) in order to avoid the overload of the page / cache problem.</p>
  
  <p>Is there any simple example for beginners to learn to use it?</p>