Can you please elaborate on what we have to do to create the correct "vessel" for said "HTML banner that's responsive of its own right" in Revive? Because when we tried the method you outlined above, Revive rendered our responsive banner (i.e. it scaled dynamically with the width of its parent element) statically (i.e. with the fixed width/height values that we were forced to enter during the creation of "HTML5 Banners" and "Generic HTML Banners" in Revive), meaning that it didn't scale when the viewport width became lower than its max-width.
We tested this both on our CMS and otherwise emtpy HTML files to make sure that it's not our CMS template that's preventing the responsiveness.
