title: negative margins in css: good tutorial and tricks site?
body: <p>One of the css aspects which confuses me sometimes when I look at a site is negative margins used for layout. It takes me a while to understand what the designer is trying to do with negative margins across the page. I mean a page which has several div's, several using negative margins and I am trying to get my head trying to figure them out. I use Firebug to changes the values and see the effect.</p>
  
  <p>Is there a good tutorial, bag of tricks site which teach a web designer how to use negative margins to their advantage. Of course tricks which work cross browser.</p>
  
  <p>Trying to figure out what margin-left:-100% does.</p>