<html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>认识head标签</title>
<style type="text/css">
h1{
font-size:100px;
color:blue;
text-align:center;
}
</style>
</head>
<body>
<h1>欢迎来到慕课网</h1>
</body>
</html>
