The default grid system is a 12-column grid. It also has four responsive variations for various devices and resolutions: phone, tablet portrait, table landscape and small desktops, and large widescreen desktops.

<div class="row">
  <div class="span4">...</div>
  <div class="span8">...</div>
</div>

As shown here, a basic layout can be created with two "columns," each spanning a number of the 12 foundational columns defined as part of the grid system.

To nest your content, just add a new .row and set of .span* columns within an existing .span* column. Nested rows should include a set of columns that add up to the number of columns of it's parent. For example, two nested .span3 columns should be placed within a .span6.

<div class="row">
  <div class="span12">
    Level 1 of column
    <div class="row">
      <div class="span6">Level 2</div>
      <div class="span6">Level 2</div>
    </div>
  </div>
</div>

What Are They

For faster mobile-friendly development, use these basic utility classes for showing and hidding content by device.

When to use

Use on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device's presentation.

For example, you might show a <select> element for nav on mobile layouts, but not on tablets or desktops.

Support Classes

Shown here is a table of the classes we support and their effect on a given media query layout (labeled by device). They can be found in responsive.less.