Create a Lightbox effect only with CSS – no javascript needed

You may call it Lightbox, or Greybox, or Thickbox, but it’s always the same effect.

When you are on a page, and click on a photo or trig some event, a Lightbox is an effect that fades the pagein the background to show you new content in the foreground.

Courtesy: http://www.emanueleferonato.com/2007/08/22/create-a-lightbox-effect-only-with-css-no-javascript-needed/