.js-scroll {
    opacity: 0;
    transition: opacity 500ms;
  }
  
  .js-scroll.scrolled {
    opacity: 1;
  }
  
  .scrolled.fade-in {
    -webkit-animation-name: fade-in;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: ease-in-out;
    animation: fade-in 1s ease-in-out both;
  }
  
  .scrolled.fade-in-bottom {
    -webkit-animation-name: fade-bottom;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: ease-in-out;
    animation: fade-in-bottom 1s ease-in-out both;
  }
  
  .scrolled.slide-left {
    -webkit-animation-name: slide-in-left;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: ease-in-out;
    animation: slide-in-left 1s ease-in-out both;
  }
  
  .scrolled.slide-right {
    -webkit-animation-name: slide-in-right;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: ease-in-out;
    animation: slide-in-right 1s ease-in-out both;
  }
  
  @keyframes slide-in-left {
    0% {
      -webkit-transform: translateX(-100px);
      transform: translateX(-100px);
      opacity: 0;
    }
    100% {
      -webkit-transform: translateX(0);
      transform: translateX(0);
      opacity: 1;
    }
  }
  
  @keyframes slide-in-right {
    0% {
      -webkit-transform: translateX(100px);
      transform: translateX(100px);
      opacity: 0;
    }
    100% {
      -webkit-transform: translateX(0);
      transform: translateX(0);
      opacity: 1;
    }
  }
  
  @keyframes fade-in-bottom {
    0% {
      -webkit-transform: translateY(50px);
      transform: translateY(50px);
      opacity: 0;
    }
    100% {
      -webkit-transform: translateY(0);
      transform: translateY(0);
      opacity: 1;
    }
  }
  
  @keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }