Problem with layout/styles, where did I screw up?

Question

css

Good afternoon!
There is a site games777.bet . On the page of any product approx. - games777.bet/room_solution/ugm/) when displayed on the mobile. version block with class .particles-js is not "cut where it should" as it is on any page other than the product page (eg games777.bet/reshenija/).

I understand that the problem is in the hands and layout, but I have already broken my head. Help me please!

Answer 1

There is no CSS rule on the incorrectly working page

body.page-template-header_particles header {
    position: relative;
}

which is on a properly working page. Or rather, it is there, but it is not applied, because body does not have a classpage-template-header_particles