Rasa-webchat in React - Enter key doesn't send message and where do you edit the css for the widget?

Hi, I have added this widget in my React project using npm install. From here: GitHub - botfront/rasa-webchat: A feature-rich chat widget for Rasa and Botfront . Clicking the arrow button sends a message but it doesn’t work when I press the Enter key. Is there a way to add that feature as some sort of parameter within <Widget /> ? Also how should I approach editing the css for the Widget? I see examples of people changing the css for it but I don’t know what file they’re editing or where it even is.