@keyframes ani-left {
    0% {
      opacity: 0;
      margin-left: -400px;
    }
    80% {
      opacity: 0.6;
    }
    100% {
      opacity: 1;
      margin-left: 0;
    }
  }
  @keyframes ani-right {
    0% {
      opacity: 0;
      margin-right: -400px;
    }
    80% {
      opacity: 0.6;
    }
    100% {
      opacity: 1;
      margin-right: 0;
    }
  }