.lucky-seven-button {
    background-color: #ff6f61; /* 明るい色に変更 */
    color: #fff;
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.3s;
    display: block;
    margin: 20px auto;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.lucky-seven-button:hover {
    background-color: #ffdc7a;
     transform: translateY(-3px);
}