material-design-rails

Add this line to your application's Gemfile:

gem 'material-design-rails'

And then execute:

$ bundle

Or install it yourself as:

$ gem install material-design-rails

Inside your application.js add

//= require material

or, for minified version

//= require material.min

Inside your application.css add

*= require material

or, for minified version

*= require material.min

You can also use SASS's @import in your application.scss, i.e.

@import "material.min";