A small tweak would be to use a background color on the render-container similar to Andy Matuschak's site — or a border/shadow on the side of each pane https:/

A small tweak would be to use a background color on the render-container similar to Andy Matuschak's site — or a border/shadow on the side of each pane https://notes.andymatuschak.org https://notes.andymatuschak.org Edit: Deploying a change to Publish sites that should make the scroll area clearer :)