body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  margin: 0;
  padding: 0;
}

#chat {
  max-width: 500px;
  margin: 20px auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

#messages {
  list-style: none;
  padding: 0;
  margin: 0 0 10px;
  max-height: 400px;
  overflow-y: auto;
}

#messages li {
  background: #e6e6e6;
  padding: 10px;
  border-radius: 5px;
  margin-bottom: 10px;
}

#input {
  width: 100%;
  padding: 10px;
  border-radius: 5px;
  border: 1px solid #ccc;
}