.scroll-left-start {
  left: 5%;
  opacity: 0.5;
  position: relative;
  transition: left 2s, opacity 2s;
}

.scroll-left {
  opacity: 1;
  left: 0;
}

.scroll-right-start {
  opacity: 0.5;
  position: relative;
  right: 5%;
  transition: right 2s, opacity 2s;
}

.scroll-right {
  opacity: 1;
  right: 0;
}