css 文件

css 文件引入

mystyle.css

body {
background-color: lightblue;
}

h1 {
color: navy;
margin-left: 20px;
}

myhtml.html

<!DOCTYPE html>
<html>
    <head>
        <!-- 引入 css 文件 -->
        <link rel="stylesheet" type="text/css" href="mystyle.css">
    </head>
    <body>

        <h1>This is a heading</h1>
        <p>This is a paragraph.</p>

    </body>
</html>