Making Banner Image Responsive To Browser Width

Hi, hoping some nice kind guru can help - Is there a simple way to make my banner image on the homepage edge to edge on the browser whilst retaining the default width for content? If the only option is to make the whole site browser edge to edge / responsive then I will go with too.

Had a big search around and could;t find anything to help.

Big thanks


PS… I'm on version 4.2.2