<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>basic css selector</title>
<style>
p {color: blue}
</style>
</head>
<body>
<p>昔人已乘黄鹤去，此地空余黄鹤楼，黄鹤一去不复返，白云千载空悠悠。</p>
<p>晴川历历汉阳树，芳草萋萋鹦鹉洲。日暮乡关何处是，烟波江上使人愁。</p>
<p>BLUE</p>
<span>Black</span>
</body>
</html>