margin and width on mobile

Hi, another question:

under settings -> appeareance -> Spacing and Opacity … PopUpWidth can be defined. The standard is 30%. Thats a beautiful width for desktops. On mobile this is very flimsy.

I can′t find the selector for this width to modify in css (if possible. I′m not a js buff)

Do you have a snippet to overwrite this setting in @media ?

EDIT: or a feature in settings (clickbox and slider):

“set popups to 80% for mobile” @media (max-width: slider) {

selector {width: 80%; margin-left: 10%;}

}