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Cascading Style Sheets are a big breakthrough in Web design because they allow developers to control the style and layout of multiple Web pages all at once. With CSS, when you want to make a change, you simply change the style, and that element is updated automatically wherever it appears within the site. – Web Glossary
CSS has a simple syntax, and uses a number of English keywords to specify the names of various style properties.
A style sheet consists of a list of rules. Each rule or rule-set consists of one or more selectors and a declaration block. A declaration-block consists of a list of semicolon-separated declarations in braces. Each declaration itself consists of a property, a colon (:), a value, then a semi-colon (;).
For example: h1 { color: white; background: orange;}
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