A CSS rule is a fundamental concept in web design that dictates how elements on a webpage are displayed. It is a statement that defines the styling for one or more elements within a web page. A CSS rule consists of two main components: a selector and a declaration block.
The selector is the part of the rule that identifies which HTML elements the CSS rule will apply to. It points to the HTML element you want to style, such as p for paragraphs, h1 for first-level headings, or .classname for elements with a specific class attribute[6].
The declaration block contains one or more declarations separated by semicolons. Each declaration within the block includes a CSS property name and a value, separated by a colon. The declaration block is surrounded by curly braces. For example, in the rule p { color: red; text-align: center; }, color and text-align are properties, while red and center are the corresponding values for those properties[6].
CSS rules can be applied to multiple selectors by separating each selector with a comma. This allows the same styling to be applied to different elements without repeating the declarations. For example, `h1, h2, h3 { font-w...
