Yes, it is possible to modify the BookNow application through the use of a Custom Style Sheet (web programming skills required).
Some examples are:
- Changing the color of the BookNow widget to match your branding
- Altering the size of the BookNow widget
- Any other alterations that CSS supports
Note: It's not possible to release the translation files, as they are global for all customers. It's also not possible to change the labels via CSS.