DIV height set as percentage of screen?

Solution 1:

Try using Viewport Height

div {
    height:100vh; 
}

It is already discussed here in detail

Solution 2:

This is the solution ,

Add the html also to 100%

html,body {

   height: 100%;
   width: 100%;

}

Solution 3:

make position absolute for that div.

http://jsfiddle.net/btevfik/KkKeZ/