'Flat Light Style' Help

In General Settings when I change the style from ‘Default’ to ‘Flat Light’, the widget is cut off on the right side. The text from my tweets + dotted lines that separate the tweets are not all contained in the background, appearing to run the length of 2 letters onto my black wordpress theme. How can I fix this so the background color takes up the entire space of the widget instead of stopping short? Please view the problem at the bottom of my site in the footer: http://www.bakesmusic.com