part-4:- External CSS in html5
External CSS
An external style sheet is used to define the style for many HTML pages.
With an external style sheet, you can change the look of an entire web site, by changing one file!
To use an external style sheet, add a link to it in the head section of the HTML page.
An external style sheet can be written in any text editor. The file must not contain any HTML code, and must be saved with a .css extension.
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