Hello there, 

I changed the color scheme of the booking system and now it is very difficult to tell which dates are available and which are not. Users have to really look hard to be able to see the 'line-through' indicating that a date is not available.

This is because the line-through is the same color as the background.

(see the attached screenshots)

Could you recommend me the css code that would fix this?

Thanks in advance.
Sam

Thanks Bogdan. It works but only when I use !important. Thanks.