How do I set up the box for tannerite/chalk board gender reveal?

Courtney • Baby Caroline was born 7/29/18😻 #Policewife #FTM

Do I keep the chalk in the bag it came in and put it in a box with the tannerite? Put the box of chalk on top of the tannerite? Help!! I have 4 pounds of tannerite and 10 pounds of chalk.