body{font-family:sans-serif;background:#FFF8E1;margin:0}
header{background:#B71C1C;color:#fff;text-align:center;padding:20px}
nav{background:#FFD700;padding:10px;text-align:center}
button{background:#B71C1C;color:#fff;padding:10px;border:none;margin:5px;border-radius:5px}
.card{background:#fff;margin:10px;padding:10px;border-radius:10px}
img{width:100%}
section{display:none;padding:20px}
.active{display:block}