!page_width = 900px

 !main_width = 620px
 !page_pad = 30px

 !sidebar_margin = 30px

 !sidebar_width = !page_width - !main_width - !sidebar_margin

 !pad = 15px
 !default_border_radius = 4px
 
 html body
   background-color= !body_bg
   color= !body_color
   a
     color= !link_color
 
 .page_width
   width= !page_width
   margin: 0 auto
   padding:

     left= !page_pad

     right= !page_pad