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

    #app {
      text-align: center;
      width: 320px;
      max-width: 100%;
      padding: 20px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
      background-color: #fff;
    }

    h1 {
      margin-bottom: 20px;
    }

    #chat-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-bottom: 20px;
    }

    #chat-box {
      width: 100%;
      height: 150px;
      border: 1px solid #ccc;
      padding: 10px;
      overflow-y: auto;
      margin-bottom: 10px;
      background-color: #f9f9f9;
    }

    #message-input {
      width: calc(100% - 22px);
      padding: 5px;
      margin-right: 10px;
    }

    #send-button {
      padding: 5px 10px;
    }

    #player-info {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: 20px;
    }

    #game-board {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 5px;
      width: 100%;
    }

    .cell {
      width: 100px;
      height: 100px;
      background-color: #ddd;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 2em;
      cursor: pointer;
      transition: background-color 0.3s;
    }

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

    #status-message {
      margin-top: 20px;
      font-weight: bold;
    }

    #restart-button {
      margin-top: 10px;
      padding: 5px 10px;
    }