Menu button color issue on mobile

Hello,

I have an issue with my website on mobile devices, on the WordPress platform the menu button is visible on all devices (white on green background on PC, tablet, mobile), but when entering the website from an actual mobile device the menu button is not visible at all if you don’t know it’s there (green on green background), any suggestions on how I might be able to fix it?

Thanks ??

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