body {
      font-family: Arial, sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
      background-color: #f4f4f9;
    }

    .container {
      text-align: center;
    }

    .board {
      display: grid;
      grid-template-columns: repeat(3, 100px);
      grid-gap: 5px;
      margin-bottom: 20px;
    }

    .cell {
      width: 100px;
      height: 100px;
      background-color: #fff;
      border: 1px solid #ccc;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 2em;
      cursor: pointer;
    }

    .cell:hover {
      background-color: #e0e0e0;
    }

    button {
      padding: 10px 20px;
      font-size: 1em;
      cursor: pointer;
    }