[web2py] modify standard layout in web2py

[BlueShadow]

Hi I'm using the standard layout one sidebar (left) and the middle colums 
for the content of my page.
I like to modify the width(increase) of the columns but every change I did 
to the skeletton.css turned out in funny results.
I can't use more colums. And I don't know why because even though they add 
up to the whole number of colums it is not using the full width of the 
screen.
Can anyone help.