body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin-top: 50px;
}

#gameBoard {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
    border: 2px solid #000;
    background-color: #f0f0f0;
}

#player, #goal {
    position: absolute;
    width: 20px;
    height: 20px;
}

#player {
    background-color: blue;
    top: 0;
    left: 0;
}

#goal {
    background-color: green;
    bottom: 0;
    right: 0;
}

.wall {
    position: absolute;
    background-color: black;
}

#controls {
    margin-top: 20px;
}

.control-button {
    width: 70px; /* ボタンのサイズを大きく */
    height: 70px; /* ボタンのサイズを大きく */
    background-color: #4CAF50;
    color: white;
    border: none;
    margin: 5px;
    font-size: 20px;
    cursor: pointer;
}