Animate Blocks into ViewPort on Scroll

@keyframes appear {
   from {
      opacity: 0;
      transform: translateX(-100px);
   }
   to {
      opacity: 1;
      transform: translateX(0px);
   }
}

.block {
   animation: appear linear;
   animation-timeline: view();
   animation-range: entry 0% cover 40%;
}