*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#eef8fb}body{font-family:ui-rounded,"Arial Rounded MT Bold","Noto Sans TC",system-ui,sans-serif}.back{position:fixed;z-index:3;top:max(10px,env(safe-area-inset-top));left:10px;display:grid;place-items:center;width:46px;height:46px;border-radius:50%;color:#263238;text-decoration:none;background:#ffffffe6;box-shadow:0 4px 16px #0002;font-size:1.4rem}iframe{display:block;width:100%;height:100%;border:0;background:white}