Chapter 1, Exercise 2 – Styling
The colors and styling of the dialogs and the header and footer are quite simple. Change the colors in those areas (or even experiment with graphics) until you find a combination you like.
You could, for example, change all of the background-color values of #369 in main.css to #900 to turn the entire game frame red. Alternatively, set a background-image on the header or footer.