CKEditor height 100%

Hello everyone. I am trying to make the CKEditor instance size to 100% so that it fills up any open space as necessary. When the browser window resizes, so should the editor.

I'm sure there's a simple way to do this but I can't seem to figure it out.

I've tried adding "config.height = '100%';" to my config file but it seems there are some parent classes to the actual editor that are constraining the height.