#snail {
    width: 30em;
    height: 20em;
    animation-name: TryingHisBest;
    animation-duration: 50s;
    animation-fill-mode:forwards;
    animation-iteration-count: infinite;
  }

  @keyframes TryingHisBest {
    0% {
        transform: translateX(0px);
    }

    48% {
        transform: translateX(600px);
    }

    50% {
        transform: rotateY(180deg) translateX(-600px);
    }

    90% {
        transform: translateX(0px) rotateY(180deg);
    }

    100% {
        transform: translateX(0px);
    }
  }

article {
    position: relative;
  }
  article section {
    position: absolute;
    top: 2.44em;
    width: 500px;
    left: -500px;
    padding: 0 1em 0.5em 0.5em;
    background-color: rgba(16, 16, 16, 0.95);
    transition: transform 0.5s;
  }
  article section nav {
    width: 110%;
    text-align: right;
    background-color: rgba(16, 16, 16, 0.95);
    padding: 0.7em;
  }
  
  .visible {
    transform: translateX(500px);
  }