Any way to target months with 6 weeks?

[JamCodesSometimes]

I'm trying to modify the calender so that the container in which I am using the calender remains the same fixed height but do not want the extra space that fixed weeks = {true} causes.

Is there a class/modifier method to target the particular months with 6 weeks or to conditionally apply CSS so I can style the calender to fit the container irrespective of the number of weeks.