CSS helps make your San Diego Web Design code compact as well as clean and its proper usage helps reduce website loading time. Browse this site http://websitein5days.com/grand-rapids-website-design/ for more information on San Diego Web Design. Define common font styles, images etc. (used in a set of web pages) in one single external CSS. By doing this, you will not have to insert the same tags again and again on different pages - just call the CSS and apply that particular class.