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老师批语：
1、绝对定位的登录页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style>
body {
margin: 0px;
}
.box {
position: absolute;
width: 100%;
height: 100%;
background-color: lightgray;
}
.login {
position: absolute;
width:300px;
height:200px;
background-color: lightblue;
left: 50%;
top: 50%;
margin-left: -150px ;
margin-top: -100px;
}
.login form {
text-align: center;
}
</style>
</head>
<body>
<div class="box">
<div class="login">
<form action="" method="get">
<h3>用户登录</h3>
<span>用户：</span>
<input type="text" placeholder="请输入正确的用户名" autofocus><br><br>
<span>密码：</span>
<input type="password" placeholder="请输入正确的密码"><br><br>
<button>登录</button>
</form>
</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
2、固定定位的qq客服
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style>
body {
margin: 0;
}
.box {
position: absolute;
width: 100%;
height: 3000px;
background-color: lightgreen;
}
.box1 {
position: absolute;
width: 100%;
height: 30px;
background-color: lightblue;
}
.box2 {
position: absolute;
width: 320px;
height: 180px;
background-color: white;
border: 1px solid black;
top: 30px;
}
.box3 {
position: absolute;
width: 80px;
height: 270px;
background-color: white;
border: 1px solid black;
right: 0;
top: 30px;
}
.box4 {
position: absolute;
width: 317px;
height: 90px;
background-color: white;
border: 1px solid black;
top: 210px;
}
.qq {
position: fixed;
width:400px;
height:300px;
background-color: white;
right: 0;
bottom: 0;
margin-left: -150px ;
margin-top: -100px;
}
button {
float:right;
border: none;
background: none;
color:black;
font-size: 22px;
margin-top: 5px;
margin-right: 2px;
}
</style>
</head>
<body>
<div class="box">
<div class="qq">
<div class="box1"><button>X</button></div>
<div class="box2">聊天内容</div>
<div class="box3">个人资料</div>
<div class="box4">发送消息</div>
</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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