Properties
Properties refer to what visual aspects of an HTML element you want to change. Examples of properties include font and background colors, widths, heights, borders, etc. A list of the legal properties that your web browser allows you to modify can be found in the CSS property reference.
Color
http://www.w3schools.com/cssref/default.asp#color
Backgrounds & Borders
http://www.w3schools.com/cssref/css3_pr_background.asp
Display
http://www.w3schools.com/cssref/default.asp#basic
Positioning
http://www.w3schools.com/cssref/pr_class_position.asp
Text
http://www.w3schools.com/cssref/default.asp#text