index.html

<style>
    body{
        margin:0;
        background: #1a1a1a;
    }
    canvas {
        width: 100vw;
        height: 100vh;
        object-fit: contain;
        image-rendering: pixelated;
    }
</style>
<canvas id="canvas"></canvas>
<script src="./main.js"></script>