* {
    box-sizing: border-box;
   }
   
   body {
     font-family: Arial, sans-serif;
     background-color: #f9f9f9;
     display: flex;
     justify-content: center;
     align-items: center;
     height: 100vh;
     margin: 0;
   }
   
   #game-container {
     text-align: center;
     width: 90%;
     max-width: 400px;
     background: #fff;
     border: 1px solid #ccc;
     border-radius: 10px;
     box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
     padding: 20px;
   }
   
   #game-title {
     font-size: 24px;
     margin-bottom: 20px;
     color: #333;
   }
   
   #player-info {
     font-size: 18px;
     margin-bottom: 10px;
     color: #555;
   }
   #player-name-input {
     margin-bottom: 20px;
   }
   
   #player-name-input input {
     padding: 10px;
     margin: 5px;
     border: 1px solid #ccc;
     border-radius: 5px;
     font-size: 1rem;
     width: 45%;
   }
   
   #player-name-input button {
     padding: 10px 20px;
     margin-top: 10px;
     border: none;
     background-color: #007bff;
     color: white;
     border-radius: 5px;
     cursor: pointer;
     font-size: 1rem;
   }
   
   #player-name-input button:hover {
     background-color: #0056b3;
   }
   
   #scoreboard p {
     font-size: 14px;
     margin: 5px 0;
     color: #666;
   }
   
   #game-board {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     grid-gap: 10px;
     margin: 20px 0;
   }
   
   .cell {
     width: 100%;
     padding-top: 100%;
     position: relative;
     background-color: #eaeaea;
     border: 2px solid #ddd;
     border-radius: 5px;
     font-size: 2.5rem;
     font-weight: bold;
     color: #333;
     cursor: pointer;
     transition: background-color 0.3s, transform 0.2s;
     text-align: center;
   }
   
   .cell:hover {
     background-color: #f0f0f0;
     transform: scale(1.05);
   }
   
   #restart-button {
     background-color: #007bff;
     color: white;
     border: none;
     padding: 10px 20px;
     font-size: 1rem;
     cursor: pointer;
     border-radius: 5px;
     transition: background-color 0.3s;
     width: 100%;
   }
   
   #restart-button:hover {
     background-color: #0056b3;
   }
   
   #winner-message {
     font-size: 18px;
     margin-top: 15px;
     color: #28a745;
     display: none;
   }
   
   @media screen and (max-width: 768px) {
  
    #game-container {
      width: 100%;
      padding: 10px;
    }
  
    #game-title {
      font-size: 20px;
      margin-bottom: 15px;
    }
  
    #player-info {
      font-size: 16px;
      margin-bottom: 8px;
    }
  
    #player-name-input input {
      width: 100%;
      margin: 8px 0;
    }
  
    #game-board {
      grid-gap: 5px;
    }
  
    .cell {
      padding-top: 80%;
      font-size: 2rem;
    }
  
    #scoreboard p {
      font-size: 12px;
    }
  
    #player-name-input button,
    #restart-button {
      width: 100%;
      padding: 10px;
      font-size: 1rem;
    }
  }