html { font-family: sans-serif; background: url('background.jpg') no-repeat;}
.animation {
  
}

/* pas recommandé, mieux de faire sur sections 
https://stackoverflow.com/questions/70416821/can-i-use-content-visibility-on-all-elements
*/
div, p { content-visibility: auto; contain-intrinsic-size: 100px auto; }


@keyframes fadein {
    0% { opacity: 1; }
    50% { opacity: 0; }
	100% { opacity: 1; }
}