## environment.rb
# for the css part of the layout to work, you have to let sinatra know that /css/main.css is equal to the main.sass file
get '/css/main.css' do
  headers 'Content-Type' => 'text/css; charset=utf-8'
  sass :main
end

## layout.haml
!!! Strict
%html
  %head
    %link{:rel => 'stylesheet', :href => '/css/main.css', :type => 'text/css'}
    %title= SiteConfig.title
  %body
    = yield
## index.haml
#container
  #left
    %p Text on the left!
  #right
    %p Text on the right!
  .clear

## main.css
.clear
  :clear both

#container
  :width: 500px
  #left
    :background blue
    :width 225px
    :margin-right: 25px
    :float left
  #right
    :background right
    :width 225px
    :margin-left 25px
    :float left