Logo cropping on header

The theme forces cropping on the logo to an absurdly small 159×54 px. Not a big problem on desktop but the logo looks terrible on mobile.

Tried to circumvent this with an svg support plugin but, since the theme tries to crop it anyway, there is a cropping error when using svg.

Letting the user skip cropping would pretty much solve the issue.

The page I need help with: [log in to see the link]