Trouble finding CSS class to remove header image from a specific page

Greetings, our theme is unfortunately no longer supported, but we still want to continue using it, which is why I’m asking for help here.

I understand how to use CSS to remove the header image from a specific page, however I am struggling to find the correct CSS class.

This is what I have currently in custom CSS:
.page-id-391 .site-branding {
display: none;
}

I have tried every possible class I can find from inspecting the element, but nothing seems to work.
Can anyone perhaps tell me what I’m missing?

Thank you so much!

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



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