Basic pricing table style missing period.

Hi, any idea how to fix the “Basic” pricing table style to include the period (e.g., month, day, etc.)? I like this simple style the best but I am selling a monthly subscription so it needs to show that the price is per month. As it is now, it only shows the price. The other two pricing table styles (Standard & Ultimate) show /month, which is what I’m looking to add to the Basic pricing table. Thank you!