You can set up booking areas where your agents can book your product directly. If you have not set up booking agents yet, here you have more information on how to set up booking agents. If you have not created a booking area for your agent yet, here you have information on how to set up your agents booking areas.
In the booking area themes you can choose the colours to customise the basic feel of your booking areas. To add a new theme select "Add". To edit a current theme select the title of the current theme.
The settings you have are to select colours for the different components of your Booking area. When you have set your theme, remember to save before leaving the page: