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In the field of web design, CSS (Cascading Style Sheets) is a very important language. Its function is to control the style of web pages to make them more beautiful, concise and easy to read. For beginners who want to enter the field of web design, learning to create effective CSS files is a crucial step. Below, this article will discuss how to create CSS files, as well as some basic CSS rules and techniques.
1. Create a CSS file
<head> <link rel="stylesheet" type="text/css" href="styles.css"> </head>
Note: "styles.css" here should be the name of the CSS file you created.
2. Basic properties of CSS
When writing CSS files, you need to learn and understand the basic properties of CSS. CSS properties control the style of web pages. Here are some common properties:
color: red;
font-family: Arial, sans-serif; font-size: 16px;
background-color: #ffffff; background-image: url(background.jpg);
border: 1px solid black;
line-height: 1.5;
3. Basic rules and techniques of CSS
If you have multiple CSS rules and they apply same HTML element, the browser will use priority rules to determine which rule will be executed first. Here is the order of precedence rules: Inline style > ID selector > Class selector > Element selector.
If possible, simplify the CSS code as much as possible. For example, you can reduce the size of your CSS files by combining multiple CSS rules into a single identifier.
For example:
h1, h2, h3 { font-family: Arial, sans-serif; font-size: 16px; color: blue; }
Use class or ID selectors for each element of the page, Instead of using element selectors, you can make your CSS files simpler and easier to maintain.
CSS preprocessors can make it easier for you to write CSS code, and can also make your CSS code more modular and easier to maintain. . For example, Sass and Less are two commonly used CSS preprocessors.
Summary
After the above introduction, we have learned how to create CSS files and basic CSS rules and techniques. Beginners should remember these rules and techniques to write better CSS files. When writing CSS files, you must pay attention to the readability and maintainability of the code to facilitate future code modification and maintenance.
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