alignment’s problems with ubermenu in safari

Hi,
I use vantage premium and ubermenu. I noticed a difference just in safari in the alignment of menu, the layout is set on logo in masthead. I used the css code I found on this forum:

/* UberMenu */
.ubermenu {
margin: 30px 50px 0px 0px;
}

and it works great on every browser except safari.

Is there anything I can do?

Thanks in advance,
Alberto