body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #0a0a0a;
  color: #f3f3f3;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.card {
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 14px;
  padding: 40px;
  text-align: center;
  box-shadow: 0 0 15px rgba(255,255,255,0.05);
}

button {
  margin-top: 20px;
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 8px;
  background: #00c853;
  border: none;
  color: white;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #009624;
}


html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #000;
}

#root {
  width: 100vw;
  height: 100vh;
}

iframe {
  width: 100vw;
  height: 100vh;
  border: none;
  display: block;
}