CSS is an abreviation of Cascading Style Sheets. It’s purpose in web design is the HTML elements will appear on the chosen media. For example a printer, a PC display or mobile phone.   Maintenance or updating of a complete website design can be changed by editing one file or stylesheet, often named style.css, but can be of a person’s choosing.  There are a number of modules defined in CSS 3.   These posts will document them

• The Selectors
• The Box Model
• Backgrounds and Borders
• Image Values and Replaced Content
• Text Effects
• 2D/3D Transformations
• Animations
• Multiple Column Layout
• User Interface