I've mentioned this before... and I've just continued dealing with it.
I find it confusing that Webflow has a container - called a SECTION.
When is seems a SECTION is simply a (smart) DIV.
- and then Webflow provides another area (settings tabs) to properly identify a DIV as a (HTML-5) SECTION.
Webflow's SECTION is not an HTML-5 SECTION. It's a smart DIV.
CONTAINER is also a "smart DIV"... although there's no HTML-5 conflict with naming. A CONTAINER simply auto-margins left and right for proper centering... but it's still a DIV.
I hope I'm explaining this correctly.