How can I change the color of background border

[eryk96]

Hello, can anyone help me with changing this border color to black? All of my schemes are turned to black and I still don’t know how to chage it. This white space appears on google browser (on mobile phone) when you try to scroll down/up. I would like to change it on all pages. I am also sending a picture of website with this black border just to be more specific.

[ArvidPL]

Hello, hope all is well!

Can you give me the link to your store so I can see how we can solve this!

All the best,

Arvid, Co-founder Pent Library