body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #000;
    color: #fff;
    font-family: Arial, sans-serif;
}

#gameCanvas {
    border: 1px solid #fff;
    background-color: #111;
}

#hud {
    width: 800px;
    display: flex;
    justify-content: space-between;
    padding: 10px;
    box-sizing: border-box;
}

#energy, #time {
    font-size: 20px;
}