How to build css
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
- Create a new text file. On Windows, use a text editor such as Notepad to create a CSS file, and set the file suffix to ".css".
- Name the CSS file. CSS files should have meaningful names so you can find it easily. It is recommended that you write the name something relevant to your HTML page, such as "styles.css", as this is the name of the page where the file will contain the styles.
- Link CSS files. Use the link tag in the tag of the HTML document to link the CSS file to the HTML document. For example:
<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 (color) - Controls text color.
color: red;
- Font (font) - Controls the style and size of the font.
font-family: Arial, sans-serif; font-size: 16px;
- Background - Control the background color and background image of the web page.
background-color: #ffffff; background-image: url(background.jpg);
- Border (border) - Controls the border style and size of an element.
border: 1px solid black;
- Line-height - Controls the distance between lines.
line-height: 1.5;
3. Basic rules and techniques of CSS
- Priority rules
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.
- Simplify the code
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 part of the page
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.
- Using CSS preprocessors
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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