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Hi MARKHAM Toby,
Thank you for your post in our forum.
Per your description, we test on our side to check the font color. As we have tested many ways to change the font color, however, we are so sorry to convey that we can’t change the font color of the pop-up windows. You can see the screenshot below, which the text hyperlink of the pop-up windows display blue all the time.
Given the situation, we sincerely request that you can post your idea or add your vote to the related idea in Microsoft SharePoint UserVoice as more numbers of votes will draw the attention of related developing team.
Meanwhile, we sincerely suggest that you can use another kind of theme. Here are the steps:
Settings in the upper right corner > Change the look > Classic change the look options at the bottom of the pane > select a light tone theme > change the Colors, Site layout, Fonts on the left of the window > Try it out > Yes, keep it in the upper right corner.
Hope this can help you. 😊 We highly appreciate your cooperation and understanding! Thank you for your time.
Best regards,
Cindy
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