Are you thinking of a redesign just for the sake of it? If you answered yes to that question, it is not yet the right time to do a redesign. Remember, a design serves a specific purpose. If you are not sure whether to do an overhaul of your site, keep in mind that your current small business website design might have a specific purpose that you might not know about. You will lose that function if you do a redesign.
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When designing website customization, always choose matching colors. An example of a matching color would be to have a dark background, with visible words and designs. With the dark theme, try not to mix too many bright colors into the design. What we should NEVER do, is to mix two very different colors, such as purple and yellow. Now, of course, it would depend on the purpose of the website, but those two colors are too striking for one who wants it to look more professional.