h1 {
  text-align: center;
}

.stopwatch {
  width: 200px;
  margin: 0 auto;
  text-align: center;
  padding: 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

.time {
  font-size: 72px;
}

.controls {
  padding: 8px;
  box-sizing: border-box;
}