Level 1 of column
Level 2
Level 2
<div class="row-fluid">
<div class="span12">
Level 1 of column
<div class="row-fluid">
<div class="span6">Level 2</div>
<div class="span6">Level 2</div>
</div>
</div>
</div>
.span4
.offset4
<div class="row-fluid">
<div class="span4">...</div>
<div class="span4 offset4">...</div>
</div>
