body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
    margin: 0;
    padding: 40px;
  }
  
  .container {
    max-width: 600px;
    margin: auto;
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    text-align: center;
  }
  
  h1, h2 {
    margin-bottom: 20px;
  }
  
  .tabs button {
    padding: 10px 20px;
    margin: 5px;
    border: none;
    background: #007bff;
    color: white;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .tabs button:hover {
    background: #0056b3;
  }
  
  .tab-content {
    display: none;
    margin-top: 20px;
  }
  
  .tab-content.active {
    display: block;
  }
  
  input[type="number"], input[type="time"] {
    padding: 10px;
    width: 150px;
    font-size: 16px;
    margin: 10px;
  }
  
  button {
    margin: 5px;
    padding: 10px 20px;
    font-size: 14px;
    border: none;
    background-color: #28a745;
    color: white;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #218838;
  }
  
  #stopwatchDisplay, #timerDisplay, #localTime {
    font-size: 24px;
    margin: 20px 0;
  }
  
  ul {
    list-style-type: none;
    padding: 0;
    margin-top: 10px;
  }
  
  ul li {
    margin: 5px 0;
  }