a gist to illustrate where to place @charset directive in case you run into the dreaded "Invalid US-ASCII character "\xE2"" whilst attempting to pre-compile Sass assets

application.css.sass

@charset "UTF-8"
// This is a manifest file that'll automatically include all the stylesheets available in this directory
// and any sub-directories. You're free to add application-wide styles to this file and they'll appear at
// the top of the compiled file, but it's generally better to create a new file per style scope.
//
//= require_self

// Then we'll import the compass and html5-boilerplate extensions
@import compass/utilities
@import html5/boilerplate

+html5-boilerplate

// my own stylesheets
@import partials/page
@import partials/fonts