body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column; /* stack controls above flashcard */
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #121212; /* Dark background */
    color: #e0e0e0; /* Light text color */
  }
  
  .controls {
    margin-bottom: 20px;
    text-align: center;
  }
  
  .controls label,
  .controls select {
    font-size: 16px;
    margin: 0 5px;
    color: #e0e0e0;
    background: #1e1e1e;
    border: 1px solid #333;
    border-radius: 5px;
    padding: 5px;
  }
  
  .flashcard-container {
    width: 400px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #333;
    border-radius: 10px;
    background-color: #1e1e1e;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    text-align: center;
    margin-bottom: 20px;
  }
  
  .flashcard {
    font-size: 20px;
    color: #e0e0e0;
    padding: 20px;
    text-align: center;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .nav-buttons {
    display: flex;
    gap: 10px;
  }
  
  .nav-buttons button {
    font-size: 16px;
    padding: 8px 12px;
    background: #1e1e1e;
    color: #e0e0e0;
    border: 1px solid #333;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .nav-buttons button:hover {
    background: #333;
  }