Logo header background color

[KJA]

Greetings,

Since updating to Prestashop 1.6.1.24, I am having a hard time changing the header color specifically of the logo background header. Please see screenshot. I have tried modifying header-container background color in global.css and also used !important; tag but the part I highlighted in the screenshot is not changing. I need it in black to go with overall theme of my website and also because my logo background color is black and I want it to merge with the background color

I would highly appreciate any help on this.

website: americandiamonds.ca

Thank you so much in advance

[KJA]

Hello,

 

Still looking for help to address this issue. Please and thank you!