I solved it myself with:

.blog .header-scrolled #avia-menu .avia-menu-text {
color: #ffffff !important;
}

Thanks again.

Hi Nikko, great and thanks. Last question: and if I wanted white font menu even when scrolling only for blog page and single posts?
Thanks again

Thank you Jordan, it’s ok, you can close.
Regards.

Thank you Victoria, I solved with a new post; if I try to modify an existing demo post like “Hello World” or “A nice entry”, image (and social icons) disappears again. But it’s more easy to recreate and now it’s ok.
Thank you again.
Regards.

Hi, thanks Jordan, but it doesn’t work. The font of the options should become dark only when the drop-down menu appears.
Do you have any other solution?
Thanks in advance.

Hi, yes, I’m using Windows as many users that report me this issue. Is there a solution for the problem?
Thanks.
Regards.