Basic CSS changes and button now working

Made button bigger and badder with CSS.

Changed jQuery code so it goes red when pressed and changes to ‘IDDU’
when user lets go of mouse button. Also changed the class of the ‘div’
so it doesn’t get stuck at ‘IDDU’ with the possibility of continually
pressing it.
Merge pull request #1 from halldorel/master

Basic CSS changes and button now working