Writing CSS
There are two ways to add CSS to your Web page: write up a style sheet or put CSS code into the style attribute of the tag that you want to format.
Writing a Style Sheet
A style sheet is a block of CSS code. It appears between style tags in an HTML document, or it exists as a separate file that you import into the HTML document. A style sheet consists of one or more style rules, or presentation instructions for the browser. A style rule, in turn, consists of a style selector, which is the element that you are formatting; and a style definition, which gives attribute/value pairs that tell the browser how to display the selector.
A style sheet looks something like this:
<style type="text/css"> h1 { font-family: Arial; font-weight: ...
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