Site branding logo bad quality for smartphones

I got a custom logo for my site branding. When I open the site with my computer, the logo looks normal, but when I open the site with my smartphone, the logo looks very blurred and has a bad quality. I tested some things for example a higher pixel per inch value (The logo is a PNG file with transparent background). Is there a solution for this problem?

Website: whataboutuz.com

Hello, I’ve already answered in this topic, please let’s continue there:

I’ll close this topic to avoid confusion.

Kind Regards, Roman.