Logo Issue

Hi! I have a question for the Squarespace website we are using https://greencodecreative.com/ (We are using a custom template.)

We uploaded a white PNG version of our logo so that it showed up nicely over the header image on our homepage. But, this means it doesn’t show on any other pages (due to it being white logo on white background).

Is there some custom CSS or another workaround that can be used to make the default logo our colour version (attached) on all pages except home, where it would be the white version?

One hitch could be also that the mobile version of the website has a green background on the header for all pages, so the white logo actually works fine for all mobile pages.

Thanks!