body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f5f5f5;
}

canvas {
    border: 1px solid #ccc;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}