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A CSS style is basically a rule which specifies to a web browser about how to format a HTML element on a web page like a rule to make a headline blue, draw a border around a photo, or create a 250- pixel-wide sidebar box to hold a list of links. A style consist of two elements
- The web page element that the browser formats also called as the selector.
- The actual formatting instructions also called as the declaration block or rules block.
