Header - Change color of borders around menu

Hello I’d like to change the grey stripes above and below the header. I want them to be the same color as the black tripes on the vertical.

.utility-bar--bottom-border {
    border-color: #000;
}

.header-wrapper--border-bottom {
    border-color: #000;
}

I put it in the Header custom CSS and it made the bottom of the header black, thank you!

If i put it in the annoncement bar it makes the bottom of the anno bar black but I’d like a code that covers both in the header so that it looks the same when scrolling down, because only the header follows when scrolling.

Check it out!

Nattstudios.com

code 1234

.utility-bar.utility-bar--bottom-border {
    border-color: #000;
}

This makes the bottom of the annoncement bar black. I want the top of the header to be black.

The difference shows when scrolling.