Problem with distance between button and next element

Hi, all

As you can see on the webpage, Buy (“comprar”) buttons are nearer to next row than to their own row. How could I make they were nearer to the text above instead of next element? (I know I could enlarge bottom margin of their row, but it would make it look odd)

Thanks in advance and best regards,

The page I need help with: [log in to see the link]