body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
  }
  
  .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
  }
  
  .timer-container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
  }
  
  .timer-container h2 {
    margin: 0 0 10px;
    color: #333;
  }
  
  .timer {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 10px;
  }
  
  .btn {
    padding: 5px 10px;
    font-size: 14px;
    cursor: pointer;
    margin-right: 5px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
  }
  
  .pause-all-btn {
    background-color: #e74c3c;
    color: white;
    border: none;
    border-radius: 5px;
    margin: 20px;
  }