.toeic-box {
  max-width: 600px;
  margin: 40px auto;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 12px;
  text-align: center;
}

#timer {
  font-size: 48px;
  margin: 10px 0;
}

#start-btn {
  padding: 10px 30px;
  font-size: 18px;
  cursor: pointer;
}