Colours in nightMode

I’m trying to use nightMode and like it very much – except that it seems to be difficult to tune the colours. In particular, the ‘cloze’ colour (a pure, and therefore very dark, blue on my calibrated screen) is not readable.

I found, in styling, an entry “.nightMode .cloze {…}” but this has no effect and is implausible CSS syntax. Any ideas, anyone?

Thanks – Mike