#chat-container {
  width: 300px;
  margin: 0 auto;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

#messages {
  height: 200px;
  overflow-y: scroll;
  border-bottom: 1px solid #ccc;
  margin-bottom: 10px;
}

#message-input {
  width: calc(100% - 80px);
  padding: 5px;
}

#send-button {
  width: 70px;
}