div.mfp-content {
    text-align: center;
}
div.mfp-content .frm-popup button {
    width: 200px;
    height: 36px;
}
div.mfp-content .frm-popup .b-form__success-title {
    font-size: 26px;
    text-transform: uppercase;
    font-weight: bold;
    color: #1ab22a;
    margin: 26px 0 35px;
    transition: .2s;
}
div.mfp-content .frm-popup .b-form__success_small {
    margin-bottom: 26px;
    color: #1ab22a;
}