#conteneur{
    display: block;
    height: auto;
    border: 2px solid #eeeeee;
    overflow: auto;
}

  .anim_apparition_scal {
    animation-name: fade_scal;
    animation-duration: 3s;
  }
  @keyframes fade_scal {
    from {opacity: 0 ; transform: scale(0.3);} 
    to {opacity: 1;}
  }