iframe{display:block;width:100%;height:min(740px,85dvh);min-height:550px;border:1px solid #bdcdc5;border-radius:4px;background:white}main{max-width:900px}h1{font-size:26px}header nav{display:flex;gap:16px;flex-wrap:wrap}@media(max-width:480px){main{padding:12px}iframe{height:80dvh;min-height:530px}}