Set the height of screen to the height of div in CSS

[Robbiefritz]

I have been working on HTML5, javascript and CSS and i want to get the height of screen and set the height of my "div" accordingly in CSS only without using javascript and jquery.. so that it adjusts itself to any screen.I've tried using height=100% but it takes the height as long as div's content.Any idea plzz help me out..Thanks in advance!!