Please help me make an image go full-length across the page: a custom divider

I want to divide two sections by using an image– not an ordinary separator.

The ordinary separator does not have the aesthetically pleasing affect that i desire.

As i am desiring an Military-themed website, I want to have a stripe of a flag divide my sections.
I have accomplished this goal by using a color section and making the background image be the custom-made image.
Please view here– scroll down on the page http://www.globalbusinessincubation.com/wordpress/business-summit
…But the color section has some default padding.

1. If that could be removed, I would be able to make the American Flag Stripe smoothly separate two sections.
Imagine the blue background color section; then a red section after it….. and smooth stripe right in between the two, without any space in front of back of the stripe.

2. If i could simply insert an image and make it full-width of the website, I would also be able to succeed in my goal.
But, i cannot. For some reason, the image cannot stretch all the way across the webpage– it stops at some invisible border;
taking away from the deep effect of separation.

–Elliot