Fluid nesting
Fluid grids utilize nesting differently: each nested level of columns should add up to 12 columns. This is because the fluid grid uses percentages, not pixels, for setting widths.
<!DOCTYPE html> <html> <head> <title>Bootstrap Tutorial</title> <link href="css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="row-fluid"> <div class="span12"> Fluid 12 <div class="row-fluid"> <div class="span6"> Fluid 6 <div class="row-fluid"> <div class="span6">Fluid 6</div> <div class="span6">Fluid 6</div> </div> </div> <div class="span6">Fluid 6</div> </div> </div> </div> </body> </html>