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

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px; /* ボタン間のスペース */
}

button {
    padding: 20px 40px;
    font-size: 24px;
    cursor: pointer;
    width: 600px; /* ボタンの幅を指定 */
}