How to make wrapper of full height of page?

Question

please visit http://appkify.com, its wordpress site.

When you click on Categories tab, the height of wrapper decreases to content height. Is theire any way to make it full height?

I've tried adding following property but it then making body background to come as a border for all posts.

html,body, #wrapper {
  height:100%;
}

Answer 1

Wrapper has automatic height. It get's created. And as you write the contents to it gets bigger. However by putting the height as 100%, when the overflow occurs while writing the wrapper it will get scroll bar on your webpage rather then on a browser.