Website Accessibility Report 2
Web Content Accessibility Guidelines
Guideline 2. Don't rely on color alone.
Many people cannot recognize the difference between different hues. There are also people who use non-color or non-visual displays, and the color won't even show up if you put it there. Images need to have a background and a foreground color that are definitely separate so as to not be confused. Background colors and text colors should also have significant contrast so those you have difficulties with colors will be able to read them without trouble.
In order to facilitate this guideline, it is best to be sure your colors are different enough (in all cases: images, background/foreground, text color, etc.) that people won't have difficulty telling them apart. Another thing to help make sure you have them right is to test your website when seen through a black and white monitor (one that only shows grayscale colors) and make sure that everything is readable and understandable. Images should be chosen so as to be sure they don't blend into everything else or themselves. Fonts should all be different from the background so the text doesn't just disappear into the background. CSS styles should be used so they can be easily turned off and still have the content there in black and white. Be sure that color isn't the only thing you rely on to get your point across.