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Pure is a set of small, responsive CSS modules that you can use in every web project realized by the yahoo developer team. This gem adds Pure CSS 0.5.0 to the Assets Pipeline of Rails 3.2.

Additionally it provides

  • a jQuery function that automatically enables the dropdown menu without the need of additional rails packages/frameworks (YUI or others).
  • a small optional set of css for right-aligned horizontal menus, CSS carets (font-independent), vertical separators, alerts, ...

I cite directly from

CSS with a minimal footprint.

Pure is ridiculously tiny. The entire set of modules clocks in at 5.7KB minified and gzipped, without forgoing responsive styles, design, or ease of use. Crafted with mobile devices in mind, it was important to us to keep our file sizes small, and every line of CSS was carefully considered. If you decide to only use a subset of these modules, you'll save even more bytes.

Note: will_paginate is integrated with purecss pagination style using the purecss-will_paginate gem.

Build Status


Add this line to your application's Gemfile:

gem 'purecss'

And then execute:

$ bundle

Then you can add the following directives to your css manifest file (application.css):

*= require purecss

for the responsive bundle, or

*= require purecss-nr

for the non-responsive one.

If you want to include just an individual module (see add instead

*= require purecss/<module>

If it is too long for you, you can avoid touching the manifest files and run the generator (with optional parameter responsive/nonresponsive):

$ rails generate purecss:install

To add the viewport meta in the head of your application.html.erb it is enough to append --add_viewport_meta when you run the generator.


After the installation you can simply go to and use their styles.

Custom CSS

Add to your css manifest file, under the require purecss line:

*= require purecss-addons

It provides the CSS classes

  • pure-custom-caret for the dropdown menu (to use if you are not using FontAwsome)
  • (no more needed) pure-menu-custom-separator-vertical to add a vertical separator to the horizontal menu
  • pure-custom-close for nicer x to close eventual modal views (to display modals, bootstrap-modal works quite well with Pure)
  • pure-custom-alert, pure-custom-alert-error, pure-custom-alert-success, pure-custom-alert-warning
  • pure-menu-pull-right to align the menu to the right (must be in the same tag of pure-menu, see this example). Thanks to msweeney for this workaround.

Dropdown Menu

For dropdown menu I developed a small workaround based on bootstrap-dropdown.js. It is enough to add the following directive to your js manifest file (application.js):

//= require purecss-dropdown

and then use the class pure-menu-has-children for the li that will contain the submenu, add data-toggle="dropdown" to its label element (tipically an anchor), and use the class pure-menu-children for the ul that contains the submenu.

I hope it becomes clear with the following example:

<header class="header pure-u-1"> 
  <div class="pure-menu pure-menu-open pure-menu-fixed pure-menu-horizontal">
      <div class="pure-menu-heading"><%= link_to "sample app", root_path, id: "logo" %></div>
          <li><%= link_to "Home", root_path %></li>
          <li><%= link_to "Help", help_path %></li>
          <% if signed_in? %>
            <li><%= link_to "Users", users_path %></li>
            <li class="pure-menu-can-have-children pure-menu-has-children">
              <a href="#" data-toggle="dropdown">Account <span class="pure-custom-caret"></span></a>
              <ul class="pure-menu-children">
                <li><%= link_to "Profile", current_user %></li>
                <li><%= link_to "Settings", edit_user_path(current_user) %></li>
                <li class="pure-menu-separator"></li>
                  <%= link_to "Sign Out", signout_path, method: "delete" %>
          <% else %>
            <li><%= link_to "Sign In", signin_path %></li>
          <% end %>

My dropdown menu code do not support dropdown submenus, for that you can use YUI as in example, or pull me a workaround :)


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request
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