Blank bar on the top for Firefox and Safari

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Hello,

I am using WordPress to develop my association website with pleasure.

I have just a “small” pb ?

I have a top bar blank or white appears on my pages but only on firefox, safari. In Chrome everything is good.

Is there a parameters around initiale padding margin I forgot to do ? or something else to solve this ?

Thanks for your help and sorry for my english, I am french 🙁

Thais

PS : I am using Ocean WP