body {
    animation: fadein 3s forwards;
  }

@keyframes fadein {
    0% {opacity: 0}
    100% {opacity: 1}
  }
  
  
  .fadein {
    opacity: 0.1;
    transform: translate(0, 50px);
    transition: all 800ms cubic-bezier(.17,.67,.67,.91);
  }
  
  .fadein.scrollin {
    opacity: 1;
    transform: translate(0, 0);
  }