:root{--bg:#fff;--fg:#1a1a1a;--rule:#e5e5e5}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;color:var(--fg);margin:0;font-family:Arial,Helvetica,sans-serif}main{flex-direction:column;min-height:100%;display:flex}header{padding:16px max(16px, env(safe-area-inset-left));border-bottom:1px solid var(--rule)}h1{margin:0;font-size:20px}iframe{border:0;flex:1;width:100%;min-height:760px}