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A CSS rule-set consists of a selector and a declaration block:
The selector points to the HTML element you want to style. The declaration block contains one or more declarations separated by semicolons. Each declaration includes a CSS property name and a value, separated by a colon. Multiple CSS declarations are separated with semicolons, and declaration blocks are surrounded by curly braces.
In this example all <p> elements will be center-aligned, with a red text color:
p { color: red; text-align: center; }
You will learn much more about CSS selectors and CSS properties in the next chapters.