How to read css
CSS (Cascading Style Sheets) is a markup language commonly used in web design. It can control the style, layout and interactive effects of web pages. CSS was originally introduced by the World Wide Web Consortium (W3C) and is now part of the standards. When learning CSS, you first need to understand the basic syntax and common properties of CSS, and then learn how to apply CSS to web design.
First let’s look at the basic syntax of CSS. CSS is composed of selectors and attributes. Elements in HTML are selected according to the selector, and then the style of the element is defined through attributes. Here is a simple CSS syntax example:
h1 {
color: red;
font-size: 24px;
}What this CSS code block does is select the h1 element in the HTML and then set its font color to red and font size to 24 pixels. In this code block, h1 is the selector, color and font-size are attributes, and red and 24px are attribute values.
When learning CSS, you also need to understand some commonly used CSS properties and values. The following are some commonly used CSS properties and their functions:
- color: Set the text color.
- font-size: Set the text font size.
- background-color: Set the background color of the element.
- margin: Set the element margins.
- padding: Set the inner margin of the element.
- border: Set the element border.
- width/height: Set the width and height of the element.
- display: Set the display mode of elements.
When applying CSS, you need to embed the CSS code into HTML or save it as a separate CSS file and then reference it in HTML. The following are some commonly used CSS application methods:
- Embed CSS code in HTML
Use the style tag in the head tag of HTML to embed CSS code, as shown below :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>My Page</title>
<style>
h1 {
color: red;
font-size: 24px;
}
</style>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>In this example, we embed the CSS code into HTML and set the font color of the h1 element to red and the font size to 24 pixels.
- Save the CSS code as a separate CSS file
Save the CSS code as a separate CSS file and reference it in the HTML as follows:
In a separate CSS file, we can define all styles and apply the styles by referencing this file in HTML.
CSS is a very important part of web design. You can create modern, beautiful, and user-friendly web pages by mastering CSS syntax and common properties.
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