body {
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 20px;
  }
  
  h1 {
    font-size: 2em;
    margin-bottom: 20px;
  }
  
  input {
    padding: 10px;
    font-size: 16px;
    margin-right: 10px;
    width: 200px;
  }
  
  button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
  }
  
  .square-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, 50px);
    grid-gap: 10px;
    justify-content: center;
    margin-top: 20px;
  }
  
  .square {
    width: 50px;
    height: 50px;
    background-color: red;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
  }
  
  .square.green {
    background-color: green;
  }