body {
    margin: 0;
    padding: 0;
    background: #fff;
    overflow: hidden;
    font-family: Arial, sans-serif;
}
canvas {
    display: block;
    margin: 0 auto;
    background: #fff;
}
.debug {
    position: absolute;
    top: 10px;
    left: 10px;
    color: black;
    font-size: 12px;
    z-index: 1000;
    background: rgba(255,255,255,0.8);
    padding: 5px;
    border-radius: 3px;
}