body {
    text-align: center;
    align-items: center;
}

#board {
    background-color: black;
    border-top: 5px solid skyblue;
    border-bottom: 5px solid skyblue;
}

.difficulty-container {
    display: inline-block;
    justify-content: center;
}

.difficulty-btn {
    background-color: #333;
    color: white;
    border: 2px solid #555;
    padding: 10px 20px;
    margin: 0 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 5px;
}

.difficulty-btn:hover {
    background-color: #555;
    border-color: #777;
}

.difficulty-btn.active {
    background-color: #4CAF50;
    border-color: #4CAF50;
}

.difficulty-btn.easy.active {
    background-color: #4CAF50;
}

.difficulty-btn.medium.active {
    background-color: #FFA500;
}

.difficulty-btn.hard.active {
    background-color: #FF4444;
}

.instructions {
    color: rgb(0, 0, 0);
    margin: 20px;
    font-size: 14px;
}