Menu color

Hello,

On this website : https://outillages.pro.valletinformatique.fr/ , I set the mobile menu to have a white background and black icone hamburger like this : https://outillages.pro.valletinformatique.fr/wp-content/uploads/2025/10/Capture-decran-2025-10-10-161215.jpg

But that’s not working, can you help please ?