Why don't some pages fill the full screen height on mobile devices?

Question

css

If you look at the page europrestige.spb.ru/klassicheskie-kuhni from a mobile device (I watched from iphone 6 and alcatel one touch idol 2),
then the content is not displayed at the full height of the screen (it is not filled). Why is this happening ?
If you look at the same page from a regular monitor, then in the footer there is a small indent from the bottom
of the site on wordpress

Answer 1

Here is the style that breaks the desktop.

.hentry {
    margin: 0px 0px 1.5em;
}