body {
    font-family: 'Arial', sans-serif;
    background-color: #f9f9f9;
    text-align: center;
    margin: 0;
    padding: 0;
}

#game-container {
    width: 400px;
    margin: 0 auto;
    border: 2px solid #ccc;
    background: #fff;
    padding: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

#message-area {
    font-size: 20px;
    color: #333;
    margin-bottom: 10px;
}

#image-area {
    width: 100%;
    height: 200px;
    position: relative;
}

#bomb-image {
    width: 100px;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: transform 0.3s ease;
}

#button-area {
    margin: 20px 0;
    display: flex;
    justify-content: center;
}

#switch-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* 横5つの列 */
    grid-template-rows: repeat(4, 60px);  /* 縦4つの行、高さ60px */
    gap: 10px; /* ボタン間の間隔 */
}

#switch-buttons button {
    width: 60px;
    height: 60px;
    font-size: 18px;
    background-color: #f0f0f0;
    border: 2px solid #ccc;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
}

#switch-buttons button:disabled {
    background-color: #ddd;
    color: #999;
    cursor: not-allowed;
}


#start-area {
    margin-top: 10px;
}

#start-button {
    font-size: 20px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}

#start-button:hover {
    background-color: #45a049;
}