: Re: Maintain font color when changing background color in ebook The chapter headings and some specific lines in the book are red font, which shows up fine in normal (white background) reading mode.

@Karen

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To accomplish this, you would need to write a css media query supported in kindle which detects whether night mode is activated.

Here's a two year old thread about the topic. Not very useful, btw, and they go off on a tangent. They offer advice about how to create css media queries to target specific devices. This is not a good strategy for dealing with the issue.

You should download the latest Amazon Publishing Guidelines and maybe ask on the KDF technical formatting forum whether someone had stumbled upon a solution. I just looked there and found nothing.

In web browsers, you can make a css media query to detect night mode by matching color; ie, if color=black, then use this css color, etc. But that wouldn't work on a specific platform like Kindle, I'm guessing.

The thinking behind night mode is to provide complimentary colors. Its algorithm for determining what is complimentary is not documented yet, nor do I know a css media query for Kindle which you can use. It would require a good amount of testing to figure it out on your own, I'm guessing.

At the moment, I don't see an easy way to accomplish what you want -- though there probably is a need. That said, I do generally trust the algorithms in night mode which try to maximize contrast.

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