body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f9f9f9;
  }
  
  #messages {
    border: 1px solid #ccc;
    padding: 10px;
    height: 200px;
    margin-bottom: 10px;
    background-color: #fff;
    width: 450px;
  }
  
  .message {
    margin-bottom: 8px;
    padding: 5px;
    border-bottom: 1px solid #eee;
  }
  
  form {
    display: flex;
    gap: 10px;
  }
  
  button {
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
  }