integration Buttons in Dialogflow Web demo Chatbot

i have a question about chatbots with dialogflow. I am currently building a chatbot in Dialogflow. I would like to add this chatbot to my website. My problem is that this chatbot should also contain buttons, that the user can click on this. I have built some buttons,but I can't see the buttons in the Dialogflow web demo. There are buttons on dialogflow console, but it isn't shown on the web demo. Does anyone know what that could be? I only found it as a source kommunicate.io, which didn't really help me either.

Thanks for answers..