Avoid using color to communicate information
Some people are unable to see differences in color. Writing, "The most important information you need to know is highlighted in blue," can be a problem for people with color-blindness. Use other ways to point out specific information (italics, bullets, asterisk).
Color Contrast
Some people have difficulty perceiving text if there is too little contrast between foreground and background.
For example, when using the featured link content type choose images that contrast well with the black or white text options provided.
Unsure? Use these onine color contrast checking tools: