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Selectors are usually HTML elements or tags you want to define, properties are attributes you want to change, and each property has a value. Attributes and values are separated by colons and surrounded by curly braces, thus forming a complete style declaration:

The basic syntax of CSS is: 1. CSS rules consist of two parts: a selector and one or more declarations;2. Selectors are usually HTML elements that need to be styled;3. Each declaration consists of an attribute and a value;4. Attributes and attribute values are separated by colons.

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