body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
  }
  
  .container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
  }
  
  .card {
    background-color: white;
    padding: 20px;
    margin: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }
  
  .buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
  }
  
  button {
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
  }
  
  .progress-container {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
  } 
  
  button:hover {
    background-color: #45a049;
  }
  
  .timer, .score {
    font-size: 18px;
    margin-top: 20px;
  }

@keyframes blinkRed {
    0% { background-color: #ff0000; }
    50% { background-color: transparent; }
    100% { background-color: #ff0000; }
  }
  
  @keyframes blinkGreen {
    0% { background-color: #00ff00; }
    50% { background-color: transparent; }
    100% { background-color: #00ff00; }
  }
  
  progress.blink-red {
    animation: blinkRed 2.5s 2;
  }
  
  progress.blink-green {
    animation: blinkGreen 3.5s 2;
  }
  
  .change {
    font-size: 14px;
    font-weight: bold;
    margin-left: 10px;
  }
  
  .change.increase {
    color: green;
  }
  
  .change.decrease {
    color: red;
  }