body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

#game {
    position: relative;
    width: 600px;
    height: 700px;
    margin: 0 auto;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: transparent;
}