To create css in a separate file, you must first create the style document. This is a text document with the extension ".css". For this example, we will call this document "style.css", and place it in the same directory as your html page.

Then, in the <head> of your HTML document, insert the following markup:

<link rel="stylesheet" href="style.css">

The 'style.css' file will now be linked to your HTML file, and you can now write CSS in that file.
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