body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#gameCanvas {
    display: block;
    background-color: #0e0e0e;
}

#overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(14, 14, 14, 0.9);
    color: #fff;
    text-align: center;
    padding-top: 200px;
}

#overlay h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

#overlay button {
    padding: 15px 30px;
    font-size: 24px;
    cursor: pointer;
}