I have one question about adding a "color bar".
How do I extend the Twenty Twelve Theme on the right part to add a color bar, wich will start from the top (header) and end with the site ending (footer).
The bar should be maybe 20 px wide and have two colors. One Color should end with the navigation, than the other color follows to the end.
To show what I mean, I've made a litte sketch, please look here http://s16.postimg.org/76n89t0j9/page.jpg
I'm a noobie, so I hope someone can help me. Thank you.