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Create an HTML file and save it with a .html extension.
Choose one of the following methods to add CSS to your HTML document: Inline CSS: Add the style attribute directly to an HTML element. Example: <h1 style="color: blue;">Hello World</h1>. Internal CSS: Use a <style> tag inside the <head> section of your HTML file. Example: <style> h1 { color: blue; } </style> External CSS: Create a separate .css file (e.g., styles.css) and link it to your HTML file using a <link> tag in the <head> section. Example: <link rel="stylesheet" href="styles.css">
If using an external CSS file, write your CSS rules in the .css file. Example:
body {background-color: lightgray;}h1 {color: blue;text-align: center;}Copied!✕CopySave your files and open the HTML file in a web browser to see the applied styles.
CSS Tutorial - W3Schools
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
CSS
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Test and edit CSS code interactively with W3Schools Tryit Editor.
Bootstrap
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About CSSCSS Tutorial - GeeksforGeeks
Mar 3, 2026 · This section focuses on CSS techniques that help you create flexible and adaptable web designs. You’ll learn how to build layouts that work well on …
CSS Tutorial
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Getting started with CSS - Learn web development | MDN
Nov 7, 2025 · In this article, we will get you to take a simple HTML document and apply CSS to it, learning some practical details of the language along the way. We will also review some additional …
CSS, SCSS and Less - Visual Studio Code
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