The Layout and Structure of the WordPress Twenty Twelve Theme
Two-column default layout of the Twenty Twelve theme
The two-column layout — one of the most common layouts for blogs and used more and more on general websites — is the default in Twenty Twelve and includes a content area on the left, a widget-ready sidebar on the right, and a footer area with four widget-ready spaces.
One-column page layout of the Twenty Twelve theme
Twenty Twelve’s one-column layout can be applied to WordPress Pages via the page template feature. This one-column layout comes in very handy for such pages as product sales pages, e-mail subscription form pages, photography or portfolio pages, and other content that you don’t want bothered by distractions on the sidebar.
Color adjustments you can make to the Twenty Twelve theme
By default, the header text (site title) in the Twenty Twelve theme is a dark grey, almost black, color, and the background color of the site is light grey. You can easily change the colors of the header text and site background by using the theme customizer.