Using Primer CSS - A Simple and Transparent CSS Library for Web Development Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Cascading Style Sheets (CSS) is a style sheet language used to describe the presentation of a document written in HTML or XML. CSS helps you to control the layout and appearance of web pages. In this article, we will discuss the concept of Primer CSS, a CSS library that provides a simple and easy-to-use set of styles for web development. Obvious and transparent: That means the code is understandable for all coders or all beginners. When code is obvious and transparent, it means that it is easy to understand, maintain, and modify. It is clear and concise, and there are no hidden complexities or surprises that might cause confusion or errors. Obvious and transparent code is also easy to read and follow, and it doesn't require a lot of mental effort to understand what it is doing. For writing understandable code, we will be learning some principles that are going to make our code more obvious and transparent. They are the following: Use a meaningful class or id name that describes the visual style applied. Primer CSS provides an intuitive set of class names.Use comments to explain your code. Comments can help you remember what your code is doing and help others understand your code. Avoid unnecessarily complex writing code. If there is a simpler way to do something, use it.The class names are easy to understand and remember, making it easy for developers to use them in their code.Primer CSS provides styles that can be applied to any HTML element without affecting its layout or functionality.The styles provided by Primer CSS have a minimal impact on the underlying HTML structure of the page, making it easy for developers to apply them without worrying about how they will affect the page's structure or behavior. Some classes that are used in this article: .bg-white: This class sets the background color of an element to white..text-black: This class sets the text color of an element to black..border: This class sets a border around an element with a width of 1 pixel..rounded: This class rounds the corners of an element..p-4: This class sets the padding of an element to 4 pixels..m-4: This class sets the margin of an element to 4 pixels. Syntax: <div class="bg-white"> ... </div> Example 1: HTML <!DOCTYPE html> <html> <head> <title>Primer CSS</title> <link rel="stylesheet" href= "https://unpkg.com/@primer/[email protected]/dist/primer.css" /> </head> <body> <div class="ml-6"> <h1 class="color-fg-success"> GeeksforGeeks </h1> <h3>Primer CSS Obvious and transparent</h3> <br /> </div> <div class="bg-white text-black border rounded p-4 m-4"> This is a sample text with Primer CSS styles applied. </div> </body> </html> Output: Example 2: HTML <!DOCTYPE html> <html> <head> <title>Primer CSS</title> <link rel="stylesheet" href= "https://unpkg.com/@primer/[email protected]/dist/primer.css" /> </head> <body> <div class="ml-6"> <h1 class="color-fg-success"> GeeksforGeeks </h1> <h3>Primer CSS Obvious and transparent</h3> <br /> </div> <button class="color-bg-sponsors-emphasis text-white border rounded p-2 m-6"> Click me! </button> </body> </html> Output: Reference: https://primer.style/#obvious-and-transparent Comment More infoAdvertise with us Next Article CSS Introduction P pokhrajverma6266 Follow Improve Article Tags : Web Technologies CSS CSS-Questions Primer-CSS 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