Top Bar extends either side of Banner, Why?

I have dragged a Top Bar stack to a position beneath my Banner but, it extends to both sides of the banner area. How do I change this so that it is the same width as the banner image?
Strange thing is that this only happens when I preview in Firefox, It is OK in both Google and Safari.
Ronnie West.

Try putting it in a foundation one column stack.

Do you mean a 1 column stack inside of the Partial that I created? If so, I tried but it didn’t do what I wanted. I must be doing something wrong.