body {
    margin: 0;
    overflow: hidden;
    background: black;
}

#gameCanvas {
    display: block;
    background: radial-gradient(circle at center, #000020, #000000);
}

#playAgainBtn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px 40px;
    font-size: 28px;
    background: #00eaff;
    border: none;
    border-radius: 10px;
    color: black;
    display: none;
    cursor: pointer;
}