How to Add CSS Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Adding CSS (Cascading Style Sheets) to your HTML is essential for creating visually appealing and user-friendly web pages. In this guide, we will explore the three primary methods to link CSS to HTML documents: inline, internal, and external CSS. Each method has its advantages and best-use scenarios, helping you decide the best approach for your web development needs.Methods to Link CSS to HTMLNote: It is a best practice to keep your CSS separate from your HTML1. Inline CSSInline CSS allows you to apply styles directly within HTML tags using the style attribute. This method is useful for small-scale styling or when you need to apply a unique style to a single element.Example: In this example, we will add CSS using inline styling. HTML <!DOCTYPE html> <html> <head> <title>Inline CSS</title> </head> <body> <h2 style="color: green;"> Welcome to <i style="color: green;"> GeeksforGeeks </i> </h2> </body> </html> Output:2. Internal CSSInternal CSS involves adding CSS styles directly within the HTML file by including them inside the <style> tags. This method is more efficient for applying styles to a single HTML document and keeps your CSS code more organized compared to inline styling.Note: It's best to add the <style> tags within the <head> section to ensure the styles are read before the body content is loaded.Example: In this example, we will use the internal CSS approach for styling the web page. HTML <!DOCTYPE html> <html> <head> <title>Internal CSS</title> <style> h2 { color: green; } </style> </head> <body> <h2>Welcome to GeeksforGeeks</h2> </body> </html> Output:3. External CSSExternal CSS involves creating a separate CSS file with a .css extension and linking it to the HTML file using the <link> tag. This method is the most efficient for large projects, as it separates the design from the content, allowing for better code maintainability and reusability.Example of External CSS:1. Create a file named styles.css: CSS h2 { color: green; font-size: 20px; } 2. Link this CSS file in your HTML: HTML <!DOCTYPE html> <html> <head> <title>External CSS</title> <link rel="stylesheet" href="styles.css"> </head> <body> <h2>Welcome to GeeksforGeeks</h2> </body> </html> Output:Best Practices for Using CSS in HTML:Inline CSS:Best for small, unique styles on individual elements.Quick styling for one-time changes or testing.Applied directly to the HTML element using the style attribute.Internal CSS:Ideal for single-page websites or when styling a single document.Defined within the <style> tag in the <head> section.Easier to manage than inline CSS but still limited to one page.External CSS:Recommended for larger projects and multi-page websites.Provides better organization, maintainability, and reusability.Styles are defined in separate .css files and linked to the HTML through the <link> tag. Comment More infoAdvertise with us Next Article CSS Introduction J jsshashank123 Follow Improve Article Tags : Web Technologies CSS CSS-Basics CSS-Questions Similar Reads CSS Tutorial CSS stands for Cascading Style Sheets. It is a stylesheet language used to style and enhance website presentation. CSS is one of the three main components of a webpage, along with HTML and JavaScript.HTML adds Structure to a web page.JavaScript adds logic to it and CSS makes it visually appealing or 7 min read CSS Introduction CSS (Cascading Style Sheets) is a language designed to simplify the process of making web pages presentable.It allows you to apply styles to HTML documents by prescribing colors, fonts, spacing, and positioning.The main advantages are the separation of content (in HTML) and styling (in CSS) and the 4 min read CSS Syntax CSS is written as a rule set, which consists of a selector and a declaration block. The basic syntax of CSS is as follows:The selector is a targeted HTML element or elements to which we have to apply styling.The Declaration Block or " { } " is a block in which we write our CSS.HTML<html> <h 2 min read CSS Selectors CSS Selectors are used to target HTML elements on your pages, allowing you to apply styles based on their ID, class, type attributes, and more. There are mainly 5 types of selectors.Basic CSS Selectors: These are used to target elements by tag, .class, or # ID for fundamental styling needs.Combinato 7 min read CSS Comments CSS comments are used to add notes or explanations to your code, helping you and others understand it better. They start with /* and end with */ and can be used for both single-line and multi-line comments. Note: Comments are ignored by browsers, so they won’t affect how your webpage looks or works. 2 min read CSS Colors CSS colors are used to set the color of different parts of a webpage, like text, background, and borders. This helps make the page look more attractive and easier to read. You can define colors using names, hex codes, RGB values, and more.You can try different formats of colors here- #content-iframe 5 min read CSS Borders Borders in CSS are used to create a visible outline around an element. They can be customized in terms ofWidth: The thickness of the border.Style: The appearance of the border (solid, dashed, dotted, etc.).Color: The color of the border.You can try different types of borders here- #custom-iframe{ he 5 min read CSS Margins CSS margins are used to create space around an element, separating it from neighboring elements and the edges of the webpage. They control the layout by adjusting the distance between elements, providing better organization and readability.Syntax:body { margin: value;}HTML<html> <head> 4 min read CSS Height and Width Height and Width in CSS are used to set the height and width of boxes. Their values can be set using length, percentage, or auto.Width and HeightThe width and height properties in CSS are used to define the dimensions of an element. The values can be set in various units, such as pixels (px), centim 4 min read CSS Outline CSS outline is a property used to draw a line around an element's border. It does not affect the layout, unlike borders. It's often used to highlight elements, providing a visual emphasis without altering the dimensions of the element.Syntaxselector{ outline: outline-width outline-type outline-color 4 min read Like