<style>
    html, body {
        margin: 0; 
        height: 100%; 
        overflow: hidden;
    }
    canvas {
        image-rendering: pixelated;
    }
</style>
<body>
    <canvas id="canvas" width="120" height="120"></canvas>
    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');

        ctx.fillStyle = 'green';
        ctx.fillRect(10, 10, 100, 100);
    </script>
</body>