body {
  font-family: Arial, sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
  background: #fff;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#display {
  font-size: 3rem;
  margin: 1rem 0;
}

.buttons button {
  padding: 0.7rem 1.2rem;
  margin: 0.5rem;
  font-size: 1rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  background-color: #007bff;
  color: white;
  transition: background 0.3s;
}

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

#laps {
  margin-top: 1rem;
  list-style: none;
  padding: 0;
}

#laps li {
  background: #e9ecef;
  margin: 5px 0;
  padding: 0.5rem;
  border-radius: 0.3rem;
}