Change navigation logo and background

Hello,
I would like to change the header navigation of my Leto Theme WebSite positioning the logo (site-branding) in the center of the navbar. (I don’t need the navitems, I removed them, I just need the logo).
I would also like to make the navbar always white (not transparent) and not only while scrolling or hovering (both on mobile and computer).
How can I do?

Thanks in advice for your help.

Hi,

Can you share a link to website you need help with? So, I can help you in a better way.

Regards,
Kharis
aThemes Support