body {
      font-family: Arial, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      background-color: #f0f0f0;
    }
    h1 {
      margin-bottom: 20px;
    }
    .board {
      display: grid;
      grid-template-columns: repeat(3, 100px);
      grid-template-rows: repeat(3, 100px);
      gap: 5px;
    }
    .cell {
      background-color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2em;
      cursor: pointer;
      border: 1px solid #ccc;
    }
    .cell.taken {
      cursor: not-allowed;
    }
    #status {
      margin-top: 20px;
      font-size: 1.2em;
    }
    button {
      margin-top: 15px;
      padding: 8px 16px;
      font-size: 1em;
      cursor: pointer;
    }