Thanks, @Lucas. One of the things I can’t get the section to do, though:
One of the effects of using the Flex is that as the browser shrinks, the margins around the container seem to shrink – until when you get to mobile size, there are no margins.
In Safari responsive mode, using the Flex/Container:
If I use the iPad mini 7.9" setting, I get this:
If I go to an iPhone setting, I get this - a full width container (the gray borders are actually around the “iPhone” view in Safari):
Using the Section/Container approach I can set the section to a fill mode of “flexible” with a width of 60%, and that works for the desktop and large sizes, but retains the margins at mobile size, like so:
It’s possible there is a way to do what I want using the Section, but I don’t seem to be able to do it.