.swiper-paginationIncrease-customs:nth-child(1):after {
    background: url("../image/product/sale/icon_24.png") center no-repeat;
    background-size: contain;
}
.swiper-paginationIncrease-customs:nth-child(2):after {
    background: url("../image/product/sale/icon_23.png") center no-repeat;
    background-size: contain;
}
.swiper-paginationIncrease-customs:nth-child(3):after {
    background: url("../image/product/sale/icon_22.png") center no-repeat;
    background-size: contain;
}
.swiper-paginationIncrease-customs:nth-child(4):after {
    background: url("../image/product/sale/icon_21.png") center no-repeat;
    background-size: contain;
}