carnet_atterrissage/user/themes/carnet-atterrissage/css/ui.css

#chargement {
    position: fixed;
    background-color: chocolate;
    padding: 5px;
    color: white;
    top: 10px;
    left: 10px;
    opacity: 1;
    transition: opacity 0.3s ease-out;
    z-index: 9999;
  }