Gradient background on page

Hello, friends. I experimented with the page background as in this post:
https://generatepress.com/forums/topic/gradient-background-on-page/

And I have one problem: the same code works differently( background size changes) on pages:

Example 1:https://neformativ.ru/kak-nachat-vesti-blog-s-nulya

Example 2:https://neformativ.ru/kak-izbezhat-matritsy

There are no additional settings on the pages. They're identical. What could be the reason?

code CSS:

body {
background: rgb(148,185,242);
background: linear-gradient(163deg, rgba(148,185,242,1) 4%, rgba(200,218,246,1) 6%, rgba(255,255,255,1) 8%);
}