Help tooltip is hidden under the toolbar on small screens

[Lunatic174]

On small screens help tooltip with Markdown markup is hidden under the toolbar.

Steps to Reproduce:

• Open the Editor on small screen (height <= 400px).
• Scroll down editor content to switch toolbar into floating mode
• Hover over the settings icon in the top right corner.
• Hover over the help icon near the Markdown markup text - top of the tooltip will be hidden under the toolbar

Expected Behavior: Tooltip will be on top of the toolbar.

Actual Behavior: Tooltip is under the toolbar.

Possible Solution: Play with z-index :)

[makhnatkin]

Also it will be great if the author of the PR thought about the Z-index system. It might be some CSS variables + text in the readme.