来自 jianwangsan.cn水哥

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
    <title>Document</title>
    <style>
        * {
            margin: 0;
            border: 0;
            padding: 0;
        }

        #app {
            position: relative;
            width: 100vw;
            height: 100vh;
            overflow: hidden;
        }

        .container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            bottom: 100px;
            background-color: #eee;
            overflow: auto;
        }

        .foot {
            position: absolute;
            left: 0;
            width: 100%;
            bottom: 0;
            height: 100px;
            background-color: #ddd;
        }

        .content {
            position: relative;
            width: 100%;
            height: 500px;
            border-bottom: 100px solid red;
        }

        .dialog {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            height: 70vh;
            width: 80vw;
            background-color: royalblue;
            overflow: auto;
        }

        .dialog-content {
            position: relative;
            width: 100%;
            height: 800px;
            background-color: forestgreen;
            border-bottom: 50px solid yellowgreen;
        }
    </style>
</head>
<body>
<div id="app">
    <div>123</div>
    <div class="container">
        <div class="content">content1</div>
        <div class="content">content2</div>
    </div>
    <div class="foot">foot</div>
    <div class="dialog">
        <div class="dialog-content">
            <span>dialog-content 1</span>
            <input type="text">
        </div>
        <div class="dialog-content">dialog-content 2</div>
        <input type="text">
    </div>
</div>
</body>
</html>
移动端fixed布局方案

来自 jianwangsan.cn水哥

来自 jianwangsan.cn水哥
