It doesn't look properly on Safari

Hi,
I have my website not displaying correctly on Safari, like the slylesheet is missing.
The website is delphiconsulting.it.
I installed BWM and WP Supercache, it works fine on Firefox and Chrome, but I get a mess in Safari.
I also tried to follow this discussion, but nothing changed:
https://kriesi.at/support/topic/theme-broken-in-safari/
so I deactivate them and then activated again, but it did not work.
Thank you for help.
Gianni Ceccano