Disabling mobile header box shadow

Hi! I was able to disable the box shadow border from desktop view with the codes you’ve suggested before:

#header{ box-shadow: none !important; }

and

#header.header-transparent.header-v4 {
box-shadow: none !important;
}

But the box shadow still appears once the theme breaks into the different sized mobile views. Is there a different line of code that would disable it from those as well? (no header border / box shadow in mobile or any size really)

Thanks!

Ticket