body {
  background: #0b0b0b;
  color: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

#stage {
  text-align: center;
}

#avatar {
  width: 320px;
  max-width: 90vw;
  transition: filter 0.15s ease;
}

#avatar.speaking {
  filter: brightness(1.05) contrast(1.05);
}

button {
  margin-top: 1rem;
  font-size: 1.2rem;
  background: #222;
  color: #eee;
  border: 1px solid #555;
  padding: 0.5rem 1rem;
  cursor: pointer;
}