body{margin:0;font-family:Arial}
.preview-bar{height:55px;background:#1f1f1f;color:#fff;display:flex;align-items:center;gap:10px;padding:0 10px}
.preview-bar select,.device-btn{padding:6px}
.device-btn{background:#333;color:#fff;border:0;cursor:pointer}
.open-btn{background:#82b440;color:#fff;padding:6px 12px;text-decoration:none}
.iframe-wrapper{height:calc(100vh - 55px);margin:0 auto;transition:.3s}
iframe{width:100%;height:100%;border:0}