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

  .timer-container {
    text-align: center;
    background: #fff;
    padding: 50px;
    border-radius: 50px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  .time {
    font-size: 10rem;
    margin-bottom: 20px;
    font-weight: bold;
  }

  .buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
  }

  button {
    padding: 10px 20px;
    font-size: 5rem;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
  }

  button.start {
    background: #4caf50;
    color: #fff;
  }

  button.stop {
    background: #f44336;
    color: #fff;
  }

  button.reset {
    background: #2196f3;
    color: #fff;
  }

  button:hover {
    opacity: 0.8;
  }