As an integral part of the website navigation, the footer should match the overall design theme for the site. Footer color and style should mirror the overall tone. Avoid making the common mistake of adding a box footer that does not match.
Opt for colors with high contrast, such as a light background with black text or a dark background with white text. Avoid using varying colors or ornate typefaces.
The footer must be there when users need it but shouldn't attract too much attention. Make it visible but modest to maintain the visual hierarchy.