CodePen

HTML

            
              
<div class="navbar">
  <div class="navbar-inner">
    <ul class="nav nav-mega">
      <li class="dropdown">
      	<a href="#" class="dropdown-toggle" data-toggle="dropdown">
      		Gadgets <b class="caret"></b>
      	</a>
        <ul class="dropdown-menu mega-menu">
          <li>
            <div class="row-fluid">
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
            </div>
            <hr>
            <div class="row-fluid">
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
              <ul class="media-list span4">
                <li class="media">
                	<a href="#" class="pull-left">
                		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                	</a>
                  <div class="media-body">
                    <h5 class="media-heading"><a href="#">Shiny Gadgets</a></h5>
                    <ul class="unstyled">
                      <li><a href="#">Subcategory One</a></li>
                      <li><a href="#">Subcategory Two</a></li>
                      <li><a href="#">Subcategory Three</a></li>
                      <li><a href="#">Subcategory Four</a></li>
                      <li><a href="#">Subcategory Five</a></li>
                    </ul>
                  </div>
                </li>
              </ul>
            </div>
          </li>
        </ul>
      </li>
      <li class="dropdown">
      	<a href="#" class="dropdown-toggle" data-toggle="dropdown">
      		Widgets <b class="caret"></b>
      	</a>
        <ul class="dropdown-menu mega-menu">
          <li>
            <div class="row-fluid">
              <div class="span8">
                <div class="row-fluid">
                  <ul class="media-list span6">
                    <li class="media">
                    	<a href="#" class="pull-left">
                    		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                    	</a>
                      <div class="media-body">
                        <h5 class="media-heading"><a href="#">Shiny Widgets</a></h5>
                        <ul class="unstyled">
                          <li><a href="#">Subcategory One</a></li>
                          <li><a href="#">Subcategory Two</a></li>
                          <li><a href="#">Sub Category Three with a Longer Name</a></li>
                          <li><a href="#">Subcategory Four</a></li>
                          <li><a href="#">Subcategory Five</a></li>
                        </ul>
                      </div>
                    </li>
                  </ul>
                  <ul class="media-list span6">
                    <li class="media">
                    	<a href="#" class="pull-left">
                    		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                    	</a>
                      <div class="media-body">
                        <h5 class="media-heading"><a href="#">Shiny Widgets</a></h5>
                        <ul class="unstyled">
                          <li><a href="#">Subcategory One</a></li>
                          <li><a href="#">Subcategory Two</a></li>
                          <li><a href="#">Sub Category Three with a Longer Name</a></li>
                          <li><a href="#">Subcategory Four</a></li>
                          <li><a href="#">Subcategory Five</a></li>
                        </ul>
                      </div>
                    </li>
                  </ul>
                </div>
                <hr>
                <div class="row-fluid">
                  <ul class="media-list span6">
                    <li class="media">
                    	<a href="#" class="pull-left">
                    		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                    	</a>
                      <div class="media-body">
                        <h5 class="media-heading"><a href="#">Shiny Widgets</a></h5>
                        <ul class="unstyled">
                          <li><a href="#">Subcategory One</a></li>
                          <li><a href="#">Subcategory Two</a></li>
                          <li><a href="#">Sub Category Three with a Longer Name</a></li>
                          <li><a href="#">Subcategory Four</a></li>
                          <li><a href="#">Subcategory Five</a></li>
                        </ul>
                      </div>
                    </li>
                  </ul>
                  <ul class="media-list span6">
                    <li class="media">
                    	<a href="#" class="pull-left">
                    		<img src="http://lorempixel.com/70/70/" alt="" class="media-object">
                    	</a>
                      <div class="media-body">
                        <h5 class="media-heading"><a href="#">Shiny Widgets</a></h5>
                        <ul class="unstyled">
                          <li><a href="#">Subcategory One</a></li>
                          <li><a href="#">Subcategory Two</a></li>
                          <li><a href="#">Sub Category Three with a Longer Name</a></li>
                          <li><a href="#">Subcategory Four</a></li>
                          <li><a href="#">Subcategory Five</a></li>
                        </ul>
                      </div>
                    </li>
                  </ul>
                </div>
              </div>
              <div class="span4">
                <h5>Featured Item</h5>
              </div>
            </div>
          </li>
        </ul>
      </li>
    </ul>
  </div>
</div>

            
          
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↑ Insert the most common viewport meta tag

CSS

            
              
body { padding: 3%; }

.nav-mega {
	width: 100%;
  .dropdown { 
		// disable relative positioning on dropdown container
		// mega-menu will get left from parent .nav-mega
		position: static; 
	}
	.dropdown-menu.mega-menu {
		@include box-sizing(border-box);
		@include border-top-radius(0);
		min-width: auto;
    width: 100%;
		margin-top: 0;
		padding: 0;
		border-color: #ccc;
		> li {
			//@include box-shadow(rgba(black, 0.1) 0 2px 6px inset);
			padding: 20px;
		}
		.media-list {
			.media { padding: 10px; font-size: 13px; }
			.media-heading { font-size: 16px; }
			//.media-object { max-width: 70px; }
		}
	}
}

            
          
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JS

            
              
            
          
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