layout tweaks

changed colors to theme
limited max width of sidebars. still a percentage, but max out so when
the window is really wide, they don’t get too wide and ugly
Merge pull request #7 from jasonost/ayo1-adjusting-main-layout

I like the color changes and am fine with the font change, but the div sizing still needs some work. Agree we shouldn't let them get too wide, but on my browser the main screen is no longer (perfectly) filled with the divs. I'll work on fixing that.