/* その場で */
.fadeIn{
    animation-name:fadeInAnime;
    animation-duration:2.5s;
    animation-fill-mode:forwards;
    opacity:0;
    }
    
    @keyframes fadeInAnime{
      from {
        opacity: 0;
        transform: translateY(30px);
      }
    
      to {
        opacity: 1;
        transform: translateY(0px);
      }
    }