Thank you for your prompt answer. The code that you suggested me, did the work but now I have problem with the content next to the menu bar.
Is it possible for you to visit this page http://gyppierros.wpengine.com/bouketa-anthodesmes/ and tell me why the content is not responding under 1024×768 resolution.
I mean is keeps three columns of products and as a result the third column does not showing right and the text above the list of products doesn’t wrap.
What should I do to have responsiveness into the content and the products?
Should I have to change something into theme options?