Cascading Style Sheets
Introduction

Cascading Style Sheets (CSS) are simple, but a sizeable topic

Technically CSS are not part of HTML, but rather an extension

CSS enable you to define a consistent 'look' for your document(s)

Style information is stated at the beginning of the document, or in a separate file

CSS are simply a formatting and presentation tool

CSS is a simple style sheet mechanism that allows authors and readers to attach style (e.g. fonts, colors and spacing) to HTML documents.

One of the fundamental features of CSS is that style sheets cascade; authors can attach a preferred style sheet, while the reader may have a personal style sheet to adjust for human or technological handicaps.