Columns not full stretch to the edge of the container ?

I am using Page building to create my home page on theme Dazzling..
Know when i create columns and in page builder it add spacing on right and left side on the columns did not stretch the page to its full container. I have select full width page but it still showing spacing on right and left side of my container .
How can i remove that spacing so my three boxes will stretch to end of the container.

You can see in that link

I want them to the edge of the container both on right and left side.

URL: http://dallasdevworks.us/PPS/