Logo size on mobile

Hi there,

I’m having a little trouble configuring the logo on the coming soon page – it is displaying fine on browser, however in mobile version it is using a ‘thumbnail’ version of the logo, so it is coming up in square format and cutting off (cropping) parts of the image.
Is there a way to configure it so that it uses either a “full” image size or specific size?

Thanks so much in advance!