External Stylesheet: A cascading style sheets (CSS) style that is written in an external **** and can be referenced by multiple ****.
(source: http://webdesign.about.com/od/css/g/bldefextstyle.htm}
So, basically you take your stylesheet syntax, such as
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body {background:#404040 url('background-url.com') fixed;)
Once you've got your stylesheet created, saved and uploaded to the server of your choice, you simply insert a code inter the <head> </head> section of your HTML page that would look like:
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<link rel="stylesheet" type="text/css" href="mystyle.css">