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<div class="bs-docs-section">
  <h1 id="grid" class="page-header">Grid system</h1>

  <p class="lead">Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes <a href="#grid-example-basic">predefined classes</a> for easy layout options, as well as powerful <a href="#grid-less">mixins for generating more semantic layouts</a>.</p>

  <h2 id="grid-intro">Introduction</h2>
  <p>Grid systems are used for creating page layouts through a series of rows and columns that house your content. Here's how the Bootstrap grid system works:</p>
  <ul>
    <li>Rows must be placed within a <code>.container</code> (fixed-width) or <code>.container-fluid</code> (full-width) for proper alignment and padding.</li>
    <li>Use rows to create horizontal groups of columns.</li>
    <li>Content should be placed within columns, and only columns may be immediate children of rows.</li>
    <li>Predefined grid classes like <code>.row</code> and <code>.col-xs-4</code> are available for quickly making grid layouts. Less mixins can also be used for more semantic layouts.</li>
    <li>Columns create gutters (gaps between column content) via <code>padding</code>. That padding is offset in rows for the first and last column via negative margin on <code>.row</code>s.</li>
    <li>The negative margin is why the examples below are outdented. It's so that content within grid columns is lined up with non-grid content.</li>
    <li>Grid columns are created by specifying the number of twelve available columns you wish to span. For example, three equal columns would use three <code>.col-xs-4</code>.</li>
    <li>If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.</li>
    <li>Grid classes apply to devices with screen widths greater than or equal to the breakpoint sizes, and override grid classes targeted at smaller devices. Therefore, e.g. applying any <code>.col-md-*</code> class to an element will not only affect its styling on medium devices but also on large devices if a <code>.col-lg-*</code> class is not present.</li>
  </ul>
  <p>Look to the examples for applying these principles to your code.</p>

  <h2 id="grid-media-queries">Media queries</h2>
  <p>We use the following media queries in our Less files to create the key breakpoints in our grid system.</p>
{% highlight scss %}
/* Extra small devices (phones, less than 768px) */
/* No media query since this is the default in Bootstrap */

/* Small devices (tablets, 768px and up) */
@media (min-width: @screen-sm-min) { ... }

/* Medium devices (desktops, 992px and up) */
@media (min-width: @screen-md-min) { ... }

/* Large devices (large desktops, 1200px and up) */
@media (min-width: @screen-lg-min) { ... }
{% endhighlight %}
  <p>We occasionally expand on these media queries to include a <code>max-width</code> to limit CSS to a narrower set of devices.</p>
{% highlight scss %}
@media (max-width: @screen-xs-max) { ... }
@media (min-width: @screen-sm-min) and (max-width: @screen-sm-max) { ... }
@media (min-width: @screen-md-min) and (max-width: @screen-md-max) { ... }
@media (min-width: @screen-lg-min) { ... }
{% endhighlight %}

  <h2 id="grid-options">Grid options</h2>
  <p>See how aspects of the Bootstrap grid system work across multiple devices with a handy table.</p>
  <div class="table-responsive">
    <table class="table table-bordered table-striped">
      <thead>
        <tr>
          <th></th>
          <th>
            Extra small devices
            <small>Phones (&lt;768px)</small>
          </th>
          <th>
            Small devices
            <small>Tablets (&ge;768px)</small>
          </th>
          <th>
            Medium devices