.asteroide{margin:8px}#hero{width:100%;position:relative;padding-top:10vh}#formDate{background:#000;border-radius:20px;padding:10px;display:flex;justify-content:center;align-items:center;flex-direction:column}#formDate>button{margin-top:10px}#app{background:none}.background{position:absolute;z-index:-1;width:100%;height:100%;background-color:#112341}.background>*{position:absolute;width:10%}.background>.bas{bottom:10%}.background>.haut{top:20%}