body {
    background-color: #34495e;
    color: white;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    padding-top: 30px;
}

.header {
    width: 400px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.back-btn {
    color: #e74c3c;
    text-decoration: none;
    font-weight: bold;
    background: white;
    padding: 5px 10px;
    border-radius: 5px;
}

.score-board {
    font-size: 20px;
    font-weight: bold;
    color: #f1c40f;
}

canvas {
    background-color: #000;
    border: 4px solid #ecf0f1;
    border-radius: 5px;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

.instructions {
    margin-top: 20px;
    color: #bdc3c7;
}