hiding Instagram feed on mobile

Site URL: https://www.ladiesdrawingnigh.org

Can anyone tell me how to hide my Instagram feed on mobile?  I tried code I saw here, but it did not work.

I'd really like to do something like the attached pic (show only 2 rows, 4 pics total, of the Instagram feed--right now it's showing all 7 pics that I have on my computer).  I'd also like to know how to get the white border around each pic), but if I can't, then I'll just not show Instagram on mobile.  So, if anyone can give code for this and where to insert it, that would be awesome!  I know how to get the tan background.  Thank you!!

Add to Home > Design > custom CSS to remove instagram on mobile

@media screen and (max-width:640px) {
div#page-5dbdbd0b52537379a6690756 {
    display: none;
}
}