META tags are HTML code that enable the Search Engines to determine what keywords are relevant to a specific site. About 80 percent of all web site traffic originates from the eight major search engines. It would be a good idea to make sure you've done your homework and fully understand how to optimize your web pages prior to designing your site. This will save you a lot of headaches in the long run. Be cautious when selecting your background and text colors.
Busy backgrounds make text difficult to read and draw the attention away from the text.
Always be consistent with your background theme on each page of your site. Your site should be nicely organized and uniform throughout. Keep in mind, colors affect your mood and will have an affect on your visitors as well. Bright colors such as yellow and orange, cause you to become more cheerful or happy, while colors such as blue and purple have a calming effect. Dark colors such as brown and black have a depressing effect.