*{box-sizing:border-box}
html,body{margin:0;padding:0;width:100%;height:100%;min-height:100%;overflow:hidden;background:#fff}
body{position:fixed;inset:0}
iframe{position:absolute;inset:0;display:block;width:100vw;height:100vh;height:100dvh;border:0;margin:0;padding:0;background:#fff}