CSS

CSS (Cascading Style Sheets) is a stylesheet language used to describe the presentation of HTML documents. It controls how elements are displayed on a web page, including colors, fonts, spacing, positioning, and responsive behavior. CSS lets you separate content (HTML) from presentation.

With CSS you can style a button: background-color: blue; color: white; padding: 10px 20px; border-radius: 5px; This gives you a blue button with white text, padding, and rounded corners.