CSS section is overlapping & covering publish button

I have noticed a recent Codemirror update to the plugin syntax editor has resulted in the main edit window overlapping the publish/save buttons.

To replicate, please open a Custom CSS or Custom Javascript window, make an edit, then try to press the publish button at the bottom.
You will see that the top of the button is not clickable, as the section above is overlapping.
This may be a negative margin issue or something.