index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Doom fire</title>
    <style>
        

        table {
            border-collapse: collapse;
            border: 1px solid black;
        }

        td {
            width: 5px !important;
            height: 5px;
           /* border: 1px solid black;*/
            text-align: center;
            vertical-align: center;
            font-family: monospace;
            position: relative;
        }

        .pixel-index {
            position: absolute;
            display: inline-block;
            top: 1px;
            right: 1px;
            color: gray;
            font-size: 11px;
        }
    </style>
</head>

<body>
    <div id="fireWrapper"></div>
    <script src="fire.js"></script>
</body>

</html>