top header (navigation bar ) background color in wootique

it is hard to guess what you really want.
Cheers
TR

let me give you more information about my problem

https://home.iitj.ac.in/~ug201210024/bar.html
in this image we can see when we minimize the website the background color of header is still like a infinite
or see this website https://www.flipkart.com/ (background of navigation is infinite width)

but in woocommerce background color of top navigation bar is a limited width
like in this image
https://home.iitj.ac.in/~ug201210024/bar2.html
so how to set top navigation bar color infinite

also i tried to increase width top navigation bar but then get problem like
all window size is increase like this image
https://home.iitj.ac.in/~ug201210024/bar3.html

and i am using and wootique