body {
  font-family: Arial, sans-serif;
  background: #f3f5fa;
  display: flex;
  height: 100vh;
  margin: 0;
  align-items: center;
  justify-content: center;
}

.stopwatch-container {
  background: #fff;
  padding: 2em 3em;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  text-align: center;
}

#display {
  font-size: 3em;
  margin: 1em 0;
  letter-spacing: 0.1em;
}

.buttons button {
  padding: 0.5em 1.5em;
  margin: 0 0.5em;
  font-size: 1.1em;
  border: none;
  border-radius: 6px;
  background: #007bff;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}

.buttons button:hover {
  background: #0056b3;
}