<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>{{ filename }}</title>
    <style>
        body {
            margin: 0;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        #google-viewer {
            width: 100%;
            height: 100%;
            border: none;
        }
    </style>
</head>
<body>
    <iframe 