body {
    background-color: #1e1e1e;
    color: #f5f5f5;
    font-family: 'Courier New', monospace;
    text-align: center;
    padding: 20px;
  }
  
  h1 {
    color: #c38e70;
  }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(3, 150px);
    grid-gap: 15px;
    justify-content: center;
    margin-top: 30px;
  }
  
  .tile {
    background-color: #333;
    border: 2px solid #c38e70;
    padding: 30px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .tile:hover {
    background-color: #444;
  }
  
  .tile.solved {
    background-color: #4caf50;
    border-color: #388e3c;
  }