body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 50px;
}

#timer {
  font-size: 48px;
  margin-bottom: 20px;
}

.controls button {
  padding: 10px 20px;
  margin: 0 5px;
  font-size: 16px;
}