.popup-grades-additives .popup-grades-wrapper .grades-right .swiper .swiper-slide:nth-child(1n) {
    background-image: url('/images/FunctionalEsters/Iscoaid-T.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}

.popup-grades-additives .popup-grades-wrapper .grades-right .swiper .swiper-slide:nth-child(2n) {
    background-image: url('/images/FunctionalEsters/EPSAdditive.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}

.popup-grades-additives .popup-grades-wrapper .grades-right .swiper .swiper-slide:nth-child(3n) {
    background-image: url('/images/FunctionalEsters/GMS&GTS.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}


.popup-grades-additives .popup-grades-wrapper .grades-right .swiper .swiper-slide:nth-child(4n) {
    background-image: url('/images/FunctionalEsters/EPSAdditive.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}