.login_by_google {
    text-align: center;
    background-color: #f4f4f4;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center; /* ADD THIS */
    margin: 15px 0; /* ADD THIS */
}