<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>one </title>
<style text="text/css">
#w {width:300px; height:100px; text-align:center; border-color:red blue green block; border-style; dashed}
</style>
</head>
<body>
<form
<fieldset
<p > 用户名:<input type="text" id="username" name="username" maxlength="16" ><br/>
<p align="center"><input type="submit" id="tijiao"
</fieldset>
</form>
</body>
</html>