body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
  }
  
  #container {
    text-align: center;
  }
  
  h1 {
    font-size: 32px;
    margin-bottom: 20px;
  }
  
  #board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 5px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
    width: 300px;
    height: 300px;
    margin: 0 auto;
    padding: 5px;
  }
  
  .row {
    display: flex;
  }
  
  .cell {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: #333;
    cursor: pointer;
    background-color: #e0e0e0;
    border-radius: 5px;
    transition: background-color 0.3s ease;
  }
  
  .cell:hover {
    background-color: #d0d0d0;
  }
  
  button {
    font-size: 18px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: #4caf50;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 10px;
  }
  
  button:hover {
    background-color: #45a049;
  }
  
  #message {
  font-size: 24px;
  margin-bottom: 10px;
  color: #333;
}