Invert Logo colors on scroll

I've gone through the topics but none of the similar ones seem to work. How can I get the logo to invert on scroll, so that it shows up against the black fixed header? Thanks!

Hi,

What is site url?

This is the site. Thanks!

1 hour ago, tuanphan said:

Add to Design > Custom CSS

1 hour ago, tuanphan said:

Add to Design > Custom CSS

.shrink img {
    filter: invert(1);
    -webkit-filter: invert(1);
}

 

This worked perfectly, thank you!