What is CSS? CSS is a short name for Cascading Style Sheets, published in 1996
by the HTML Editorial Review Board (ERB).
A CSS file provides a collection of rules that defines how each elements in the Web page should be presented
by specifying various presentation style properties, like:
Element Size - Width and height of the element.
White Space - Margin space and padding space.
Background - Background color and picture.
Font - Font family, size, style, color, etc..
CSS is the file extension for CSS files.
CSS files are text files. You can use any text editor to create CSS files.
Here is a sample CSS file: