grid – responsive layout

Hello, I want to use your plugin for grid columns. Full size it’s ok, but if I change size for mobile phone, I see 3 columns that are very narrow. I would like to sort himself under the correct width. how can I fix it?
Sample on the test page:
http://lacnewebstranky.6f.sk/?page_id=34

Thank you

http://wordpress.org/plugins/bootstrap-shortcodes/