Introduction to CSS

What is CSS?

Cascading: Multiple styles can overlap in order to specify a range of style from a whole web site down to a unique element. Which style gets applied pertains to the rules of CSS cascading logic.

Style: CSS deals specifically with the Presentation domain of designing a web page (color, font, layout, etc).

Sheet: Normally, CSS is a file separate from the HTML file –linked to the HTML file through its <head> (exceptions apply).

Why CSS?

Allows for much richer document appearances than HTML.

Reduce workload by centralizing commands for visual appearance instead of scattered throughout the HTML doc.

  • Use same style on multiple pages.
  • Reduce page download size.
Basic Syntax

Made up of three parts:

selector {property: value}

The selector is normally the HTML element/tag you wish to define

The property is the attribute you wish to change Every property has the value If the value is multiple words, put quotes around the value
p {font-family: "sans serif"}

To make the style definitions more readable, you can describe one property on each line

text-align: center;
color: black;
font-family: arial

Reference CSS from HTML

Inline style
inside an HTML element
Internal style sheet
inside the <head> </head>tag
External style sheet
inside external *.css file

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