Sceer Size Dependent Sidebars (2)

Hi.
I was already in contact to you with this topic:
https://generatepress.com/forums/topic/sceer-size-dependent-sidebars/#post-2475075

I have re-ordered my sidebars for mobiles with:
@media (max-width: 768px) {
#left-sidebar {
order: -1;
}
}

Now I have an additional question:
I want the re-ordering (left sidebar top) ONLY for my homepage (resp. certain pages) - for all other pages both sidebars should be arranged below the content. How can I implement this?
-Lutz