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How to Insert a Style Sheet
When a browser reads a style sheet, it will format the document according to it. There are three ways of inserting a style sheet:
External Style Sheet
An external style sheet is ideal when the style is applied to many pages. With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the tag. The tag goes inside the head section:

The browser will read the style definitions from the file mystyle.css, and format the document according to it.
An external style sheet can be written in any text editor. The file should not contain any html tags. Your style sheet should be saved with a .css extension. An example of a style sheet file is shown below:
hr {color: sienna} p {margin-left: 20px} body {background-image: url("images/back40.gif")}
Do NOT leave spaces between the property value and the units! If you use "margin-left: 20 px" instead of "margin-left: 20px" it will only work properly in IE6 but it will not work in Mozilla/Firefox or Netscape.
Internal Style Sheet
An internal style sheet should be used when a single document has a unique style. You define internal styles in the head section by using the
The browser will now read the style definitions, and format the document according to it.
Note: A browser normally ignores unknown tags. This means that an old browser that does not support styles, will ignore the
Inline Styles
An inline style loses many of the advantages of style sheets by mixing content with presentation. Use this method sparingly, such as when a style is to be applied to a single occurrence of an element.
To use inline styles you use the style attribute in the relevant tag. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph:

This is a paragraph

Multiple Style Sheets
If some properties have been set for the same selector in different style sheets, the values will be inherited from the more specific style sheet.
For example, an external style sheet has these properties for the h3 selector:
h3 { color: red; text-align: left; font-size: 8pt }
And an internal style sheet has these properties for the h3 selector:
h3 { text-align: right; font-size: 20pt }
If the page with the internal style sheet also links to the external style sheet the properties for h3 will be:
color: red; text-align: right; font-size: 20pt
The color is inherited from the external style sheet and the text-alignment and the font-size is replaced by the internal style sheet.