body {
  margin: 0;
  overflow: hidden;
  background: #0a0a2a;
  font-family: 'Arial', sans-serif;
}

#quantumCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

.overlay {
  position: absolute;
  top: 20px;
  left: 20px;
  color: white;
  z-index: 100;
}

button {
  background: #4fc3f7;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

.error {
  color: red;
  font-size: 24px;
  text-align: center;
  margin-top: 50vh;
}