/* Для стандартного попапа успеха */
#rec765924538.t-success-popup .t-popup__container .t-form__submit {
    background-color: #0088cc !important;
    border-color: #0088cc !important;
}

#rec765924538.t-success-popup .t-popup__container .t-form__submit .t-submit {
    color: #ffffff !important;
}