* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    height: 100dvh; /* phone address bar fix */
    overflow: hidden;
    background: #f7f7f7;
}

canvas {
    touch-action: none; /* no scroll or zoom on tap */
}