body {
  font-family: Arial;
  text-align: center;
  background: #111;
  color: white;
}

input, button {
  padding: 10px;
  margin: 10px;
  font-size: 18px;
}

#buzzBtn {
  width: 80%;
  max-width: 400px;
  height: 150px;
  font-size: 40px;
  background: red;
  color: white;
  border: none;
  border-radius: 15px;
  transition: 0.2s;
}

#buzzBtn:disabled {
  background: #555;
  cursor: not-allowed;
}

.locked {
  font-size: 24px;
  font-weight: bold;
  color: red;
  margin: 10px;
}

.unlocked {
  font-size: 24px;
  font-weight: bold;
  color: limegreen;
  margin: 10px;
}