It seems the problem is solved when the border width is 1px.
border-bottom: 0px !important;
Thanks for your suggestions @cscartrocks and @eComLabs
the problem with this:
[color=#696969]border-bottom: 0 !important;[/color]
Is that produce a kind of “jump” in the elements: [url=“http://screencast.com/t/AUUjhYi2M5”]http://screencast.com/t/AUUjhYi2M5[/url]
annoying. if there are some tip to fix the jump this issue will be resolved.
I really appreciate your help.
Thank you guys!