.parent {
    text-align: center;
}

    .parent > ul {
        text-align: left;
        display: inline-block;
    }

.list-text-color {
    color: white;
    font-size: 1.3em;
}

.submit_button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    opacity: 0.6;
    transition: 0.3s;
}

    .submit_button:hover {
        opacity: 1
    }