Having finished to 960px website, I am now creating the 320px version.
I have a conventional horizontal menu in the 960 site, with a transparent background
I have a hamburger menu in the 320 site, which has a grey background.
However it would appear that when I switch on the grey background for the hamburger menu, it also appears in the horizontal menu in the 960 site.
I thought it was supposed to be one menu per device. What am I doing wrong?