* {
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202%202%22%3E%3Cpath%20d%3D%22M1%202V0h1v1H0v1z%22%20fill-opacity%3D%22.05%22%2F%3E%3C%2Fsvg%3E);
    background-size: 16px 16px;
    background-color: #666;
}

canvas {
    max-width: 100%;
    object-fit: contain;
}