When you first start creating web pages, you should concentrate on content. However, it does not take long before you will want to start sprucing up your pages. Adding color elements to your page is a common thing. Various computer monitors have different color calibration and gamma default settings.
Different browsers affect the way colors are displayed.
As you get more into web graphics and read information in web books and on web sites, you will see references to hexadecimal code when talking about colors on the screen. The three colors are red, green, and blue, and these are combined differently to produce different colors. It does not matter if the letters of the alphabet are used as lower case or uppercase. In the font lesson last week, I included examples in which words were used for colors rather than hexadecimal codes. If you use words rather than codes, older browsers may not understand the codes, and there are differences between Netscape and Internet Explorer.