1.绝对定位

代码演示

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul>
        <li>item1</li>
        <li class="absolute">item2</li>
    </ul>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            border: 3px solid red;
        }
        ul {
            border: 3px solid blue;
            width: 400px;
            height: 400px;
        }
        ul li{
            height: 30px;
            border: 1px solid black;
            list-style: none;
        }
        ul li:first-child {
            background-color: yellow;
        }
        ul li:first-child + * {
            background-color: green;
        }
        ul li.absolute {
            position: absolute;
            top: 200px;
            left: 300px;
        }
    </style>
</body>
</html>

效果演示

2.固定定位

代码演示

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="box">广告位</div>
    <style>
        body {
            min-height: 2000px;
        }
        .box {
            background-color: green;
            height: 100px;
            width: 150px;
            position: fixed;
            bottom: 10px;
            right: 5px;
        }
    </style>
</body>
</html>

效果展示

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