body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #17202A;
    margin: 0;
    font-family: 'Arial', sans-serif;
}

.container {
    text-align: center;
    color: #ffffff;
}

.game-area {
    background-color: #17202A;
    display: inline-block;
    position: relative;
}

canvas {
    background-color: #34495e;
    display: block;
    margin: auto;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

#restartButton {
    position: absolute;
    left: -80px;
    top: 50%;
    transform: translateY(-50%);
    background-color: #2c3e50;
    color: #ffffff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    writing-mode: vertical-lr;
    text-orientation: mixed;
    border-radius: 20px;
    outline: none;
}

#restartButton:hover {
    background-color: #34495e;
}

.scoreboard {
    position: absolute;
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
    text-align: center;
    color: #bdc3c7;
    font-size: 20px;
}

.scoreboard span {
    display: block;
}

footer {
    margin-top: 20px;
    font-size: 14px;
    color: #bdc3c7;
}

footer span:first-child {
    display: block;
    font-size: 24px;
    margin-bottom: 5px;
}