shell.html

`
<!DOCTYPE html>
<html>

<head>
    <title>{Title Here}}</title>

    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        html,
        body {
            width: 100%;
            height: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
    .flex{
        display: flex;
    }

    .flex-center{
        align-content: center;
        justify-content: center;
    }

    </style>
</head>

<body>

    <main class="flex flex-center">

<!-- Place Demo Code Here-->

    </main>

</body>

</html>