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Cascading Style Sheets

Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in HTML.
The reason that they are called cascading is that the styling or formatting can be applied at many different points during the life of the webpage but unless the style is modified or overwritten, the original styling stays in effect.

CSS is designed so that the person authoring a web page can separate the content from the presentation.

This includes aspects such as the layout, colours, and fonts.
Separating the two aspects can has the following benefits:

  • improve content accessibility
  • provides better flexibility and control
  • provides consistency across a website when using attached style sheets

Some of the most important CSS3 features are:

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

Important Points:
Do not put styling instructions in the HTML file. Always use an attached style sheet.
The reasons for this are:

  • it makes your HTML file easier to read.
  • The same file can be attached to all pages in your site making consistent styling quick and easy

Click here to find out how to attach a style sheet