来源于：http://www.2cto.com/kf/201510/447673.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.but{
border: 0px; /*去边框*/
1000px; /*宽*/
height: 600px;/*高*/
background-image:url(img/登录.jpg);/*背景图片*/
font-size: 30px;/*字体大小*/
color: white; /*字体颜色*/
}
</style>
</head>
<body>
<form action="http://www.baidu.com">
账号：<input type="text" name="userNumber"/><br/>
密码：<input type="password" name="password"><br/>
<input type="submit" value=" " class="but" />
</form>
</body>
</html>
