Booking calendar re-design

Hello!

I run a company with a software product that manages online appointments - the target market is fitness and yoga studios. The fitness / yoga students sign up for classes through a booking calendar: you can see an example at:

https://cal.smoothbook.co/594f62e66bc6915cded537b6#/class

I need a redesign for the calendar. The layout must stay the same for now but everything else: colours, fonts, spacing, etc. can be changed.

I'm looking for something quite generic - this calendar is integrated into many websites which have different colour schemes, etc. it needs to be clean, professional, somewhat elegant?

I'm a freelancer myself and know all about the frustrations of (unpaid) re-designs on fixed price projects. Happy to do this on an hourly rate but if you could supply a realistic estimate in hours of how long you think this might take.

Thanks, James