change burger colour

[mmilo]

Hi there!
I am desperately trying to change the colour of the burger icon on one page (about), i.e. these three lines, and have used this CSS to do so:
Re: Custom burger colour change on page?

But it just doesn't work. On my home page, the burger icon is on an image, which is why the white icon is clearly visible. But on the about page, I want it to be black because it is on a white background.
Can you help me? I've also tried several other codes that I found here in these forums, but none of them work.
Thank you!

[arminunruh]

hey do u have a link to your website please?