Product listing height CSS

-- url of the page with the problem -- : fireworksland.com/stores/shirts
-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7.2
-- PHP version -- : 5.6.30
-- Browser(s) name and version -- : IPad Safari, Chrome, Firefox
-- Error-message(debug-mod must be tuned on) -- : No error message

I turned off "Height Consistency" in the listings, to eliminate the extra white space below the Options button (see the first screen shot). Turning off Height consistency did eliminate the extra white space, but it also causes uneven rows, and some rows have only one product (see the second screen shot).

Can you suggest some CSS that I can add, to keep all product listings the same height? I can experiment with different numbers; I just need to know which CSS parameter it would be.

Thank you

Thank you.

Is there some CSS I can add, which will force all product DIVs to have the same height, such as for example 250 px height?