Default gray Always mandate a background color. Bright and dark colors Bright colors are hard on the eyes over time. Dark colors can be somber and depressing. Data can take a long time to download. Ask yourself if the visual is really needed or can the same information be given with text.
Websites are many times noon linear.
They are not ment to be books. Don t make links to large or centered as they may pull attention from content. Unless this is what you want to do. Within a paragraph, use the fewest amount of words for the link. Keep them interested and wanting more.