body {
  margin: 0;
  padding: 16px;
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: white;
}
video {
  width: 100%;
  max-width: 420px;
  border-radius: 14px;
  margin-bottom: 12px;
}
button {
  width: 100%;
  max-width: 420px;
  padding: 14px;
  background: #22c55e;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: bold;
}