body {
    font-family: Arial, sans-serif;
  }
  
  #chat-box {
    width: 300px;
    height: 400px;
    border: 1px solid #ccc;
    padding: 10px;
    overflow-y: scroll;
  }
  
  #chat-box div {
    margin: 10px 0;
  }
  
  .user {
    color: blue;
  }
  
  .ai {
    color: green;
  }
  
  #input {
    width: 250px;
  }