I'm trying to copy some Excel (Windows) to either Paint (Windows) or Preview (macOS). The Excel stuff (a simple bunch of cells in a rectangular block) has a black background. However, the result of the copy-pasting shows thin white lines on the left and top borders. What to do about it? (It is a repetitive operation, so manually cropping the white lines off is not an option.)
NB: It does not help to insert left/top black columns/rows. The result after selecting and copying the right area stays the same. As this happens when copying to different apps/OSs, this makes me think this is an Excel issue, that needs to be resolved somehow in Excel.
Microsoft Office 365 ProPlus Version 1708 (Build 8431.2107 Click-to-Run)