Using the latest release of Episerver (92).
Edit mode renders the site in an iframe that is as tall as the rendered content. This breaks usage of the "vh" CSS unit, as the elements have a height of Xvh can grow very tall.
Example: I have a map with a height of 70vh. This is 675px in a maximized window in my development VM. In edit mode, this map grows steadily until it reaches a height of 3686px.
Is there any elegant workaround for this issue till today 🤔