body {
    align-items: center;
    display: flex;
    height: 100vh;
    justify-content: center;
    --bg: #FFFFFF;
    background: var(--bg);
}

body, html {
    margin: 0;
    overflow: hidden;
    padding: 0;
}

canvas { 
    max-width: 100%;
    max-height: 100%;
    display: inline-block;
    margin: 0 auto;
    vertical-align: middle;
    touch-action: none;
}