关于position

有四个属性：  

static:静止
relative：相对的
fixed：固定的（广告等信息固定在网页的某个位置，不管你上下滑动位置不变）
absolu：绝对的

.box{
display:inline-block;
 100px;
height: 100px;
background: blue;
color: rgb(71, 16, 16);
}


#two {
position: fixed;
top: 200px;
left: 100px;
background: red;
}


#one{
position: absolute;
top: 1000px;
left: 10px;
background: black;

}
 
#three{
position: sticky;
top: 200px;
left: 80px;
background: purple;


}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="positionCSS.css">
</head>
<body>
    <div class="box" id="one">one</div>
    <div class="box" id="two">two</div>
    <div class="box" id="three">three</div>
    <div class="box" id="four">four</div>
</body>
</html>