<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type"
content="text/html;
charset=utf-8">
<title>Html和CSS的关系</title>
<style type="text/css">
h1{
font-size:50px;
color:#930
text-align:center;
}
</style>
</head>
<body>
<h1> welcome to my world </h1>
</body>
</html>
color:#930 少加了分号