Overall in the OS or at some web site?
1. OS. https://www.google.com/search?q=change+windows+10+colors&ie=utf-8&oe=utf-8
2. Browser will vary with each browser so Chrome?
Read https://www.google.com/search?q=set+text+colors+in+chrome&ie=utf-8&oe=utf-8
Change the hard to read grey to a darker shade,

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