fairmediacouncil on "[Plugin: WordPress PopUp] Disable for mobile (Ive checked the other threads, they haven't worked for me)"

Hello,

I am using this plugin for my website test.fairmediacouncil.org. It does not show up on mobile, only the dark background which disables mobile users from accessing my site. Can you suggest code to disable it on mobile?

I have looked at other threads and tried adding

@media all and (max-width: 600px) {
	div.visiblebox, div.hiddenbox {
		display: none !important;
		visibility: hidden !important;
	}
	#darkbackground {
		display: none !important;
		visibility: hidden !important;
	}
}

to my style.css with no results.

Thank you.

https://wordpress.org/plugins/wordpress-popup/