Standards Agencies will develop World Wide Web pages to minimize barriers for persons using adaptive technology. Variations from these standards and the reasons for the variations must be documented. For example, features presented on every page, such as standard navigation menu for the site, should always appear in the same place. Keep backgrounds simple. Make sure there is enough contrast.
Many backgrounds obscure the text and make reading more difficult.
This is especially true for people with low vision or colorblindness, as well as for people using black and white monitors. Make sure that there is a enough contrast between your text and the background of the page. If possible, test your site with both black and white and color monitors. Avoid using nonstandard HTML tags or features. Design large buttons.