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How to create css
- PHPzOriginal
- 2023-04-13 10:44:081510browse
CSS is the abbreviation of Cascading Style Sheets, a style language used to control the appearance and layout of Web pages. In modern web design, CSS plays a very important role, making web pages look more beautiful, easier to read, and improving user experience. In this article, I will explain how CSS is created.
1. Basic syntax of CSS
CSS is mainly composed of basic components such as selectors, attributes and attribute values. Readers can understand the basic syntax of CSS through the following sample code:
selector {
property1: value1;
property2: value2;
}
Among them, the selector (selector) is used to specify the HTML element to which the style is to be applied. It can be the name, class name, ID, etc. of the element; the property (property) is the name of the style that needs to be set, such as "font- size", "color", etc.; the attribute value (value) specifies the value after the style name, which is used to define the value of the style.
2. Inline style
Inline style is the simplest form of CSS. It writes CSS code directly in HTML tags. Although this form is simple, it is not recommended because it will cause some development and maintenance problems. For example:
<p style="color:red;font-size:20px;">这是一段带有内联样式的文本。</p>
In actual development, we usually choose to write the CSS code in a CSS file, and then apply it to the web page after being defined.
3. Style sheet
- Internal style sheet
The internal style sheet is a style sheet that places CSS code in the head tag of the HTML document. Although this form is not as simple as inline styles, it is suitable for some smaller projects. For example, only styles that are needed for specific web pages can be directly embedded into HTML files in this way to achieve uniformity in the appearance of web pages.
The following is a sample code for an internal style sheet:
<head>
<style>
p {
color: red;
font-size: 20px;
}
</style>
</head>
<body>
<p>这是一个带内部样式表的段落。</p>
</body>
- External style sheet
An external style sheet stores CSS code in a separate CSS file , link to a style sheet on the page through the link tag of the HTML document. This form is suitable for medium and large projects, especially when there are multiple web pages that need to use the same style. It is very convenient to maintain and modify them uniformly.
The following is a sample code for an external style sheet:
HTML file part:
<head> <link rel="stylesheet" type="text/css" href="style.css"> </head> <body> <p>这是一个带外部样式表的段落。</p> </body>
CSS file part:
p {
color: red;
font-size: 20px;
}
4. Detailed explanation of selector
- Element selector
The element selector is a selector that selects the name of an HTML element to describe the styles applied to all elements using this element name. In other words, if you want to uniformly set all p tags in the HTML page to red, you can achieve this through the following code:
p {
color: red;
}
- ID selector
The ID selector is Selector for selecting HTML elements with a specific ID attribute. In HTML documents, the id attribute is usually unique, so the ID selector can only select one element, as shown below:
#intro {
font-size: 30px;
font-weight: bold;
}
- Class Selector
Class Selector A selector that selects HTML elements with the same class name. In an HTML document, an element can contain multiple class names, or multiple elements can be set to the same class name and styled uniformly. For example:
.text {
font-style: italic;
}
4. Summary
This article introduces the creation method and basic syntax of CSS, as well as the two forms of style sheets and a detailed explanation of selectors. Simply put, CSS allows developers to more easily control the style of web pages. Through different forms of CSS and different applications of selectors, richer and more beautiful web page effects can be achieved. I hope readers can master the creation method of CSS and improve their development capabilities through this article.
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