Changed the keyboard layout, Font, and also the colors of the keys

The colors of the keys are now in Black background and White font. These keys are pretty much like the ones on a MacBook Pro. I really like this and thats why I have done this.

I have also added one more feature that will make the color of a button Red once it has been guessed!

Do go through the changes and reply to this pull request.

i know that it is a lot of change from the font and the colors that you designed. But I thought that I should let you have a look and accept it in case you like it!