Custom Nav Bar for Secondary Pages?

Site URL: http://www,moment.film

Hey all - here's my question:

If you go to:

www.moment.film

You will see a dead simple navigation bar at the top of the page with only one thing to click on: 'Contact'. I like this. 

However when I create any secondary pages, because the logo (the word 'Moment') is white, it disappears against the white background of the secondary page header. 

See:

www.moment.film/newwork

What I want to do is create a black header unique to JUST secondary pages, so the logo can show up. Any easy way to do this?

Thanks so much in advance. 

Add this to Design > Custom CSS

body:not(.homepage) .Header-branding-logo {
    filter: invert(1);
    -webkit-filter: invert(1);
}