html,body{margin:0;width:100%;max-width:100%;height:100%;overflow:hidden;background:#f7f5f1}
/* Constrain the browsing context itself: iOS can expand a percentage-width
   iframe to its document's intrinsic width (including the full-size plan). */
iframe{position:fixed;inset:0;display:block;width:1px;min-width:100%;max-width:100%;height:100%;height:100dvh;border:0}