To much Margin on Tabs.mobile

[Werbschaft]

When adding a class of "mobile" to the Tabs and switching to Tablet or Phone View the Margins are too high (20px) and breaks the layout. I think this is a bug, in Foundation2 it works but for Foundation3 it's too much! New Code attached!

dl.tabs.mobile + ul.contained {margin-left:-15px;margin-right:-15px;}
dl.tabs.mobile {margin: 20px -15px 0px -15px;}