As we continue to improve the accessibility of the Complete Mathematics platform for all users—in particular for pupils with learning difficulties such as dyslexia, and other visual sensitivities—you may find that a useful intermediate solution would be to install a Chrome extension that allows you to modify how your browser displays the platform.
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We would recommend nOverlay (here) for changing the background display colour — there are no doubt plenty of alternatives out there too.

You can also find extensions to modify the fonts across the platform including OpenDyslexic Font for Chrome (here) — again there will be alternatives available too.

A quick note that these extensions may not work as expected in certain areas of the platform, and may in some cases affect platform performance.