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老师批语：
绝对定位登录窗口
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>绝对定位做登录窗口</title>
<style type="text/css">
body {
margin:0;
background-image:url("C:/Users/wxd-mac-win/Documents/学习/0426/static/images/php.jpg");
background-size: cover;
}
.shade {
position:absolute;
/*左上角*/
left:0;
top:0;
width:100%;
height:100%;
background-color: black;
opacity:0.7;
}
.login {
height: 220;
width:420;
background-color: lightblue;
position:absolute;
left: 50%;
top:50%;
margin-left:-210px;
margin-top:-110px;
}
.world{
width:420px;
height:160px;
text-align:center;
}
</style>
</head>
<body>
<div class="shade"></div>
<div class="login">
<div class="world">
<form action="" method="post">
<p>
<label for="usename">帐号:</label>
<input type="text" name="usename" id="usename" autofocus placeholder="不超过8个字母" requied>
</p>
<p>
<label for="password">密码:</label>
<input type="password" id="password" name="password" placeholder="6-12个字母">
</p>
<p><button>登录</button></p>
</form></div></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html>
<head>
<title>固定定位QQ客服效果</title>
<style type="text/css">
body {
height: 2000px
}
.serve {
width:150px;
height:80px;
background-color: lightyellow;
position: fixed;
right:0;
bottom:50%;
}
</style>
</head>
<body>
<div class="serve">
<span class="title">在线咨询</span><br>
<span class="signature">服务时间 9:00-20:00</span>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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