python(html 引用css)

html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="commons.css" />
</head>
<body>
    <div class="c1 c2">adsf</div>
</body>
</html>

css

.c1 {
    background-color: red;
    color: white;
}
.c2 {
    font-size: 28px;
    color: black;
}