<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
p {
color: red;
}
#para {
color: green;
}
.spec {
color: blue;
}
</style>
</head>
<body>
<p id="para" class="spec">我是段落</p>
</body>
</html>