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flex-ui
/
top-content-bottom.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0px;
            padding: 0px;
        }
        .container{
            display: flex;
            margin: 0 auto;
            width: calc(100vw - 20px);
            background-color: #fff;
            height: 100vh;
            flex-direction: column;
        }
        .header,.footer{
            background-color: #eee;
            flex:0 0 100px ;
        }

        .content{
            background-color: #eee;
            flex:1;
            margin:10px auto;
            width: calc(100% - 100px);
        }
    </style>
</head>
<body>
<div class="container">
    <div class="header"></div>
    <div class="content"></div>
    <div class="footer"></div>
</div>
</body>
</html>