The logo is not well defined

Hello everybody,
the site is fantasvaimec.it,
as you can see the logo appears blurred, undefined, even if the high resolution image is.

Why is this happening? The next idea is also to make it smaller, but is this effect a problem of size? At the moment it is 360×85, a size chosen to prevent it from moving to the left in the mobile version and not being centered.

By the way, how can you center the logo in the mobile version regardless of the size?

Is there something I’m missing?

Thank you