How do I change SciTE to use black as the background colour?
You need to change the style settings. The main change is in the user options file to the global default style and caret colour but you may have to change other style settings to make this work well: style.*.32=$(font.base),back:#000000,fore:#ffffff style.*.33=back:#C0C0C0,$(font.base) style.*.37=fore:#939393 caret.fore=#FFFFFF selection.alpha=75 selection.back=#FFFFFF colour.keyword=fore:#649bff colour.