The default for this is purple. These are red by default. There are important style and usability issues involved with choice of background and text colors. Background graphics are often distracting, lead to slower download times, and make text more difficult to read. This is particularly important if students will be printing from your site.
People learn to look for blue when they look for hyperlinks.
Using other colors for links may make it difficult to navigate through your site. Change the document's parameters. Some search engines also use titles to help index your page. It is a good idea to include a short, meaningful title here. This is the URL from which all default links will be resolved.