Rails + Compass でCSSの開発を高速化！ ref: http://qiita.com/GenTamura84/items/2b24b93026081ad36bb1

console

be compass init rails

css

.box {
  width: 100px;
  height: 100px;
  background: gray;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  -o-border-radius: 10px;
  border-radius: 10px;
}

Gemfile

group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  gem 'compass-rails'

  gem 'uglifier', '>= 1.0.3'
end

screen.css.scss

@import "icons/*.png";
@include all-icons-sprites;