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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相对定位/绝对定位</title>
<link rel="stylesheet" href="dingwei.css">
<style>
body {
background-image: url("http://www.d006.com/style/bg.jpg");
algin:center;
height: 1200px;
}
</style>
</head>
<body>
<div id="dingwei1">
<form method="get" action="http://www.d006.com">
<link>账号：</link>
<input type="username" id="username" required placeholder="请输入账号">
<link>密码：</link>
<input type="password" id="password" required placeholder="请输入密码">
<button type="button">登录</button>
</form>
</div>
<div id="kefu">
</div>
<div id="youxia">
<p>小葵花妈妈课堂开课了</p>
<p>孩子不听话怎么办？</p>
<p>多半是欠打了！</p>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
div[id="dingwei1"] {
width: 239px;
height: 148px;
text-align: center;
border-radius:21px;
background-color: #ff00a7;
border: 1px red dashed;
position: relative;
top: 300px;
left: 41%;
}
div[id="dingwei1"] form {
position: absolute;
top: 40px;
}
div[id="dingwei1"] form>input {
height: 20px;
border: 1px red solid;
}
div[id="dingwei1"] form>button {
width: 88px;
height: 38px;
color: white;
border: 0px;
background-color: cyan;
border-radius: 5px;
position: relative;
top: 10px;
}
div[id="dingwei1"] form>button:hover {
background-color: black;
}
#kefu {
width: 190px;
height: 190px;
background-image: url("https://ss1.baidu.com/6ONXsjip0QIZ8tyhnq/it/u=1809927334,1828281527&fm=179&app=42&f=JPEG?w=56&h=56");
background-repeat: no-repeat;
position: sticky;
left: 93%;
top: 50%;
}
#youxia {
width: 190px;
height: 145px;
background-color: #888888;
text-align: center;
position: fixed;
top:76%;
left: 85%;
}点击 "运行实例" 按钮查看在线实例
笔记css定位分为 position:fixed粘性定位，position:relative相对定位，position:absolute绝对定位
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