html,body{background:#fff;height:100%;margin:0;font-family:system-ui,sans-serif}iframe{border:0;width:100%;height:100%;position:fixed;inset:0}#status{color:#555;text-align:center;box-sizing:border-box;z-index:1;flex-direction:column;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}#status[hidden],button[hidden]{display:none}iframe[hidden]{visibility:hidden;display:block}button{cursor:pointer;background:#fff;border:1px solid #aaa;border-radius:4px;padding:8px 24px}