The " color: inherit;" directives in the css stylesheet are what the Kobo is unable to render. I've seen this before, but it's such a rare thing, I had forgotten about it.
You can fix the epub by editing in Calibre, Tools Menu, Filter Style Inforation, check Colors, Ok Button, and Close Button.
Save the Epub.
Alternatively,
I am personally a big fan of using Kobo's native file format, (generally called Kepub here.) You can do that by installing the KoboTouchExtended plugin in Calibre, and use Calibre to send the book to the Kobo.
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