CSS ID Selectors

Learning how to create CSS ID selectors is an essential skill in any CSS tutorial — CSS ID selectors allow you to apply unique styles to a single, specific HTML element on the page. Unlike CSS classes (which can be reused on many elements), CSS ID selectors are designed for one-of-a-kind items — things that appear only once per page, such as a site header, main navigation bar, footer, hero section, unique logo, or form submit button. In this guide, you’ll learn the syntax, how to apply IDs, when to use them vs classes, and real-world best practices using your css-practice project.