You would be able to change the Freshchat widget colour from under Settings-->Web Messenger-->Appearance. You could also have this done by customising the chat widget code using the below code snippet:


headerProperty: {


backgroundColor: '#FFFF00',


foregroundColor: '#333333',


backgroundImage: 'https://wchat.freshchat.com/assets/images/texture_background_1-bdc7191884a15871ed640bcb0635e7e7.png'


}