## app.rb
require 'rubygems'
require 'sinatra'
require 'haml'
require 'sass'

get '/css/main.css' do
  headers 'Content-Type' => 'text/css; charset=utf-8'
  sass :main
end

get '/' do
  haml :index
end

## views/layout.haml
!!! Strict
%html
  %head
    %link{:rel => 'stylesheet', :href => '/css/main.css', :type => 'text/css'}
    %title example
  %body
    = yield

## views/index.haml
#container
  #left
    %p Text on the left!
  #right
    %p Text on the right!
  .clear

## views/main.sass
.clear
  :clear both

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