Journal interior info

Slms if a person is selling journals and its to the open market muslims/non muslims. Basically its kids and adults journal/ planner. is it permissible for the person to input a birthday page as one of the pages in the journal or would this be classed haram sale.
The majority of the journal is a 52 week planner but as theres extra pages spare in the planner to make it attractive for the buyer the person wanted to title it birthday planning page.
Please advise jazakallah


May Allah bless you.

Yes its fine.

Although, scholars who see birthday celebration as haram may see the adding of such page as impermissible too.

And Allah knows best!