You can do some research on it, such as https://www.viget.com/articles/color-contrast
Lighter sights are always easier for reading than dark sites. BUt do a bit of learning or some trial and error and you will fin something that fits. White or dull white with some not pure black text works well as a general thing.
Thank you. I will give it a go. Should my efforts prove unsuccessful, there may have to be a bounty offered for a better web site design.