The css file used by octopress blog with the default theme is called
screen.css, which locates in source/stylesheets/screen.css.
The screen.scss file, which locates in sass/screen.scss, is used to generate the above css file.
```scss screen.scss @import "compass"; @include global-reset; @include reset-html5;
@import "custom/colors"; @import "custom/fonts"; @import "custom/layout"; @import "base"; @import "partials"; @import "custom/styles"; ```
In the first line,
compass, which is an open-source CSS Authoring Framework, is imported.