W3C Web Content Accessibility Guidelines (WCAG) 2.0 ...

Unity can be achieved by use of the same color, or different tints of it, or using a similar graphic style for illustrations. White Space. Areas of a design void of text or graphics. White space includes margins, gutters, space between lines of type (leading), off-set of text from images (text wraps) and any other part of the page that is empty. ................
................