Cascading Style Sheets or CSS manage the whole website designing with one-click changes. The latest version of CSS is the CSS3 version which basically differs from CSS2 in the incorporation of Modules and other changes. Modules enable the designing to be done in a lesser time with more ease while updating individual features and specifications. The CSS3 version supports many more browsers than CSS2, but be sure to test it on all operating systems and browsers.
Other major changes/additions include:
New Combinator
New CSS Selectors
New Pseudo-elements
New Style properties