body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
}
#chat-container {
  width: 320px;
  margin: 40px auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 16px;
}
#messages {
  height: 300px;
  overflow-y: auto;
  border: 1px solid #eee;
  margin-bottom: 12px;
  padding: 8px;
  background: #f1f1f1;
}
#messageInput {
  width: 70%;
  padding: 6px;
}
#sendBtn {
  width: 25%;
  padding: 6px;
  background: #1976d2;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}