What is css: css is a cascading style tag, which is used to format web pages! There are three ways to introduce css files into html files, as follows:
csss attribute writing method: tag name { attribute name: attribute value;
Attribute name: attribute value;
}
1. Inline (inline) style, written in the start tag, used through the style attribute name
<div style="color:red; height=100;">
测试文字
</div>
行内样式，写在style的""里，两个属性之间用空格隔开，属性值用分号隔开。2. Head style, written in the head tag <head></head> and used through the <style></style> tag
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>表单</title>
<style>
p{
color:red;
}
</style>
</head>3. External style, written in the head <head> tag through <link href="file address" >
<link rel="stylesheet" href="css文件位置">4. The method provided by @import css is to load the html file first and then load the css. It is not compatible with IE5 or below.