Sage Custom CSS for broken screen

Yesterday I broke my Kobo Sage screen:smack:, so now the bottom left corner is not rendering anymore (affected area: 5.5 cm height, 4.5 cm width). But this did not affect the touch capability.

Since I couldn't find any replacement screen anywhere, I was wondering if I could simply modify the CSS of the epub I am reading via Calibre to put a big margin in that area, so the text would avoid rendering in the defective corner, that way I could still somehow use my broken ereader.

Thank you for your suggestions.

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