.span12
<div class=".span12"></div>
.span6
<div class=".span6"></div>
.span6
<div class=".span6"></div>
.span4
<div class=".span4"></div>
.span4
<div class=".span4"></div>
.span4
<div class=".span4"></div>
.span3
<div class=".span3"></div>
.span3
<div class=".span3"></div>
.span3
<div class=".span3"></div>
.span3
<div class=".span3"></div>
<div class=".span7"></div>
<div class=".span5"></div>
<div class=".span6"></div>
<div class=".span6"></div>