Avoid neon or pastel colors together — they often don’t have enough contrast. (If you're not sure, test your color combinations with this free tool: WebAIM Contrast Checker)
Below is an example of poor color contrast: White text on a yellow background is hard to see because the colors are too similar.
Now here's an example of good color contrast: Navy text on a white background is much easier to read because the colors stand out from each other.
