bootstrap-sass is a Sass-powered version of Bootstrap 3, ready to drop right into your Sass powered applications.

Bootstrap for Sass

bootstrap-sass is a Sass-powered version of Bootstrap 3, ready to drop right into your Sass powered applications.

This is Bootstrap 3. For Bootstrap 4 use the Bootstrap Ruby gem if you use Ruby, and the main repo otherwise.

Please see the appropriate guide for your environment of choice:

bootstrap-sass is easy to drop into Rails with the asset pipeline.

In your Gemfile you need to add the bootstrap-sass gem, and ensure that the sass-rails gem is present - it is added to new Rails applications by default.

gem 'bootstrap-sass', '~> 3.3.6'
gem 'sass-rails', '>= 3.2'

bundle install and restart your server to make the files available through the pipeline.

Import Bootstrap styles in app/assets/stylesheets/application.scss:

// "bootstrap-sprockets" must be imported before "bootstrap" and "bootstrap/variables" 
@import "bootstrap-sprockets";
@import "bootstrap";

bootstrap-sprockets must be imported before bootstrap for the icon fonts to work.

Make sure the file has .scss extension (or .sass for Sass syntax). If you have just generated a new Rails app, it may come with a .css file instead. If this file exists, it will be served instead of Sass, so rename it:

$ mv app/assets/stylesheets/application.css app/assets/stylesheets/application.scss

Then, remove all the *= require_self and *= require_tree . statements from the sass file. Instead, use @import to import Sass files.

Do not use *= require in Sass or your other stylesheets will not be able to access the Bootstrap mixins or variables.

Require Bootstrap Javascripts in app/assets/javascripts/application.js:

//= require jquery 
//= require bootstrap-sprockets 

bootstrap-sprockets and bootstrap should not both be included in application.js.

bootstrap-sprockets provides individual Bootstrap Javascript files (alert.js or dropdown.js, for example), while bootstrap provides a concatenated file containing all Bootstrap Javascripts.

When using bootstrap-sass Bower package instead of the gem in Rails, configure assets in config/application.rb:

# Bower asset paths 
root.join('vendor', 'assets', 'bower_components').to_s.tap do |bower_path|
  config.sass.load_paths << bower_path
  config.assets.paths << bower_path
# Precompile Bootstrap fonts 
config.assets.precompile << %r(bootstrap-sass/assets/fonts/bootstrap/[\w-]+\.(?:eot|svg|ttf|woff2?)$)
# Minimum Sass number precision required by bootstrap-sass 
::Sass::Script::Value::Number.precision = [8, ::Sass::Script::Value::Number.precision].max

Replace Bootstrap @import statements in application.scss with:

$icon-font-path: "bootstrap-sass/assets/fonts/bootstrap/";
@import "bootstrap-sass/assets/stylesheets/bootstrap-sprockets";
@import "bootstrap-sass/assets/stylesheets/bootstrap";

Replace Bootstrap require directive in application.js with:

//= require bootstrap-sass/assets/javascripts/bootstrap-sprockets 

Please make sure sprockets-rails is at least v2.1.4.

bootstrap-sass is no longer compatible with Rails 3. The latest version of bootstrap-sass compatible with Rails 3.2 is v3.1.1.0.

Install the gem:

$ gem install bootstrap-sass

If you have an existing Compass project:

  1. Require bootstrap-sass in config.rb:

    require 'bootstrap-sass'
  2. Install Bootstrap with:

    $ bundle exec compass install bootstrap -r bootstrap-sass

If you are creating a new Compass project, you can generate it with bootstrap-sass support:

$ bundle exec compass create my-new-project -r bootstrap-sass --using bootstrap

or, alternatively, if you're not using a Gemfile for your dependencies:

$ compass create my-new-project -r bootstrap-sass --using bootstrap

This will create a new Compass project with the following files in it:

Some bootstrap-sass mixins may conflict with the Compass ones. If this happens, change the import order so that Compass mixins are loaded later.

bootstrap-sass Bower package is compatible with node-sass 3.2.0+. You can install it with:

$ bower install bootstrap-sass

Sass, JS, and all other assets are located at assets.

By default, bower.json main field list only the main _bootstrap.scss and all the static assets (fonts and JS). This is compatible by default with asset managers such as wiredep.

If you use mincer with node-sass, import bootstrap like so:

In application.css.ejs.scss (NB .css.ejs.scss):

// Import mincer asset paths helper integration 
@import "bootstrap-mincer";
@import "bootstrap";

In application.js:

//= require bootstrap-sprockets 

See also this example manifest.js for mincer.

By default all of Bootstrap is imported.

You can also import components explicitly. To start with a full list of modules copy _bootstrap.scss file into your assets as _bootstrap-custom.scss. Then comment out components you do not want from _bootstrap-custom. In the application Sass file, replace @import 'bootstrap' with:

@import 'bootstrap-custom';

bootstrap-sass requires minimum Sass number precision of 8 (default is 5).

Precision is set for Rails and Compass automatically. When using ruby Sass compiler standalone or with the Bower version you can set it with:

::Sass::Script::Value::Number.precision = [8, ::Sass::Script::Value::Number.precision].max

Bootstrap requires the use of Autoprefixer. Autoprefixer adds vendor prefixes to CSS rules using values from Can I Use.

assets/javascripts/bootstrap.js contains all of Bootstrap JavaScript, concatenated in the correct order.

If you use Sprockets or Mincer, you can require bootstrap-sprockets instead to load the individual modules:

// Load all Bootstrap JavaScript 
//= require bootstrap-sprockets 

You can also load individual modules, provided you also require any dependencies. You can check dependencies in the Bootstrap JS documentation.

//= require bootstrap/scrollspy 
//= require bootstrap/modal 
//= require bootstrap/dropdown 

The fonts are referenced as:


$icon-font-path defaults to bootstrap/ if asset path helpers are used, and ../fonts/bootstrap/ otherwise.

When using bootstrap-sass with Compass, Sprockets, or Mincer, you must import the relevant path helpers before Bootstrap itself, for example:

@import "bootstrap-compass";
@import "bootstrap";

Import Bootstrap into a Sass file (for example, application.scss) to get all of Bootstrap's styles, mixins and variables!

@import "bootstrap";

You can also include optional bootstrap theme:

@import "bootstrap/theme";

The full list of bootstrap variables can be found here. You can override these by simply redefining the variable before the @import directive, e.g.:

$navbar-default-bg: #312312;
$light-orange: #ff8c00;
$navbar-default-color: $light-orange;
@import "bootstrap";

Bootstrap for Sass version may differ from the upstream version in the last number, known as PATCH. The patch version may be ahead of the corresponding upstream minor. This happens when we need to release Sass-specific changes.

Before v3.3.2, Bootstrap for Sass version used to reflect the upstream version, with an additional number for Sass-specific changes. This was changed due to Bower and npm compatibility issues.

The upstream versions vs the Bootstrap for Sass versions are:


Always refer to when upgrading.

If you'd like to help with the development of bootstrap-sass itself, read this section.

Keeping bootstrap-sass in sync with upstream changes from Bootstrap used to be an error prone and time consuming manual process. With Bootstrap 3 we have introduced a converter that automates this.

Note: if you're just looking to use Bootstrap 3, see the installation section above.

Upstream changes to the Bootstrap project can now be pulled in using the convert rake task.

Here's an example run that would pull down the master branch from the main twbs/bootstrap repo:

rake convert

This will convert the latest LESS to Sass and update to the latest JS. To convert a specific branch or version, pass the branch name or the commit hash as the first task argument:

rake convert[e8a1df5f060bf7e6631554648e0abde150aedbe4]

The latest converter script is located here and does the following:

  • Converts upstream bootstrap LESS files to its matching SCSS file.
  • Copies all upstream JavaScript into assets/javascripts/bootstrap, a Sprockets manifest at assets/javascripts/bootstrap-sprockets.js, and a concatenation at assets/javascripts/bootstrap.js.
  • Copies all upstream font files into assets/fonts/bootstrap.
  • Sets Bootstrap::BOOTSTRAP_SHA in version.rb to the branch sha.

This converter fully converts original LESS to SCSS. Conversion is automatic but requires instructions for certain transformations (see converter output). Please submit GitHub issues tagged with conversion.

bootstrap-sass has a number of major contributors:

* [Thomas McDonald]( * [Tristan Harward]( * Peter Gumeson * [Gleb Mazovetskiy](

and a significant number of other contributors.

bootstrap-sass is used to build some awesome projects all over the web, including Diaspora, rails_admin, Michael Hartl's Rails Tutorial, gitlabhq and kandan.