Nesting columns
To nest your content with the default grid, 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 its parent.
<!DOCTYPE html> <html> <head> <title>Bootstrap Tutorial</title> <link href="css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="row"> <div class="span9"> Level 1 column <div class="row"> <div class="span6">Level 2</div> <div class="span3">Level 2</div> </div> </div> </div> </body> </html>