Edit CSS file (Heroku)

Hello everyone. May I know how to I edit the CSS file for my chatbot deployed on Heroku? I am using the 1 click Heroku app.

Can you edit it locally and redeploy?

I tried it out but in the end I decided to host an external CSS file on Weebly and link it to my chatbot since the website is a Weebly site. Thanks for the tip though.