body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(to bottom, #a4508b, #5f0a87);
}

canvas {
    border: 2px solid #000;
    background: transparent;
    display: block;
    width: 400px;
    height: 600px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    margin: 0 auto;
}