Change color of navigation menu in header (Dawn)

[manbru]

Hello,

I want to set my navigation menu to this color #252525, but don’t know how to do it so the color goes all the way out to the sides.

My store: https://r1vex.myshopify.com/

Here’s what my menu looks now:

And this is how i would want it to look like:

Thanks for your help!

[manbru]

sure it’s: 5850