This example demonstrates three different ways to apply Cascading Style Sheets (CSS) to an HTML document: inline, internal, and external styling. The page displays three lines of text, each using a distinct method: the first uses an inline style attribute, the second uses an internal `<style>` block, and the third applies an external stylesheet. The code uses standard HTML elements and plain CSS, with no JavaScript libraries or frameworks involved, highlighting the fundamental syntax and precedence of CSS styling approaches.