#certify {
  position: relative;
  width: 800px;
  margin: 0 auto;
}

#certify .swiper-slide {
  width: 400px;
  height: 640px;
  text-align: center;
  background: transparent;
}

#certify .swiper-slide img {
  display: block;
  width: 340px;
  height: 566px;  
}

#certify .swiper-slide-next {
  background: #fff;
}

#certify .swiper-slide-prev {
  background: #fff;
}

#certify .swiper-slide-next img {
  opacity: 0.3 !important;
}

#certify .swiper-slide-prev img {
  opacity: 0.3 !important;
}

#certify .swiper-slide img {
  opacity: 0.3;
}

#certify .swiper-slide-active img {
  opacity: 1 !important;
}