With Custom CSS enabled under Extra Features, BookingBug allows you to further customise the look of your BookingBug Booking From as well as the BookingBug widget to fit better with your Business website. (Custom CSS is an advanced feature that should only be used if you are confident using HTML/CSS)
From the Dashboard, click the Cog/Settings icon.
Click Dept Settings.
Under the Custom Booking Form CSS field, click Customise CSS.
Enter the desired CSS and click Save.
Note: Customising the CSS will affect all places where your booking widget is embedded, including 3rd party sites (as long as the booking process is not also customised to that specific site).