This is the only part customers see
Everything else in this product happens backstage. The training, the model, the actions, the inbox: none of it is visible to the person on your website. They see a coloured bubble in the corner and whatever it says when they click it. That is the entire product, as far as they are concerned.
Which is why the copy matters more than the colours. A widget that opens with "Hi! How can I help today?" gets a different response rate to one that opens with "Ask me anything about shipping, returns or sizing." The first is polite noise. The second tells the visitor what this thing is actually good for, and people only type when they believe they will get an answer.