Woocommerce tabs css overwritten

Hi!

I think woocommerce single product tabs css is overwritten in my site (link of site is an example). I guess it is overwritten by other plugin, but after deactivating most of them I can't figure out which one was causing this error.

So, could you help me to fix this issue?

I was thinking about asking you where is the original css placed so I can add '!important;', but maybe there is a better fix.

Thank you in advance.