.stack {
  position: relative;
  padding: 100px 0;
  overflow: hidden;
}

.stack-line {
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(255,255,255,.15),
    transparent
  );
}

.stack-container {
  max-width: 1200px;
  margin: auto;
  padding: 0 24px;
}

.stack-header {
  text-align: center;
  margin-bottom: 48px;
}

.stack-swiper {
  pointer-events: none;
}

.stack-swiper .swiper-slide {
  width: 140px;
  display: flex;
  justify-content: center;
}

.stack-swiper img {
  height: 56px;
  object-fit: contain;
  opacity: 0;
  filter: grayscale(100%);
  transform: translateX(24px);
  transition:
    opacity .6s ease,
    transform .6s ease,
    filter .3s ease;
}

/* Logos vão "surgindo" */
.stack-swiper .swiper-slide-active img,
.stack-swiper .swiper-slide-next img {
  opacity: .4;
  transform: translateX(0);
}

.stack-swiper .swiper-slide-next + .swiper-slide img {
  opacity: .7;
}

.stack-swiper .swiper-slide-next
+ .swiper-slide
+ .swiper-slide img {
  opacity: 1;
  filter: grayscale(0);
}