Make Transparent Background

Usually backgrounds can be made transparent only for Images, but there is a tricky idea to make text as Background:

Create a Header which should float at the top fix some minimum height

Set opacity to 0.5

Important thing position should be absolute

Now  Create your remaining content as divs

That's it. Enjoy

Sample should be like this:

http://jsfiddle.net/Jv9Mj/2/