I use the theme demo.thrivethemes.com/tt/?theme=Voice on my

Hello!

I use the theme demo.thrivethemes.com/tt/?theme=Voice
on my site http://guidadieta.it.

I hided parts of the navigation with:
.msd .sb {display: none !important;}
.msd .si {display: none !important;}

Strangly, it works in Firefox, but in Chrome not really, I still see the whole navi I wanted to hide.... Cache delete didn't help.

Does anybody know why this is so, and if there is a way to solve it?