Problem with spaces between widgets in my sidebar

Hello,

I can't find a way to change the space between the widgets in the sidebar. I have two different sidebars on my site, with the same problem.

Link to first sidebar:

Médailles – lacapsule – Capsules de champagne et Médailles de collection

Link to second sidebar:

Capsules – lacapsule – Capsules de champagne et Médailles de collection

(Sorry for my English, I hope I'm clear enough)

Sincerely,

Stéphane