In HTML

How would I get my right column to look like the green right column? Using CSS I've included my code . What do I need to change in .example? Thank you.

CS2830 Multi-Column Layout (Note: This is just an example with fictitious numbers. Computer science is the scientific and practical approach to computation and its applications. It is the systematic study of the feasibility, structure expression, and mechanization of the methodical procedures (or algorithms) that underlie the acquisition, representation, processing, storage, communication of, and access to information An alternate, more succinct definition of computer science is the study of automating algorithmic processes that scale. A computer scientist specializes in the theory of computation and the design of computational systems. Its fields can be divided into a variety of theoretical and practical disciplines. Some fields such as computational complexity theory (which exploresthe fundamental properties computational and intractable problems), are highly abstract, while fields such as computer graphics and WEB DEVELOPMENET emphasize real- world visual applications Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network). Web development can range from develcping the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social services. A more comprehensive list of tasks to which web Use the format as an example for the challenge.) Left Column Physical Width: Middle Column Physical Width 153px->Content Width 24px -padding 26px->margin 455px->Content Width 25px->padding 15px-margin 5px- border 17px->border 220px 500px network Wrapper Content Width: 220px->left column 500px-middle column + -right column development commonly refers may include web engineering. web design, web content development, client liaison, client-side/server-side scripting. web server and network security configuration, and e-commerce development Among web professionals, "web development usually refers to the main non des gn aspects of building web sites: writing markup and coding 280px left middle right wrapper 220px+500px right 1280px right 560px physical width of content width+ padding+ margin+border physical width right content width+23px+ 17px+ 20px 560px right content width 500px