How to color mobile bar

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for lack of understanding the website terminology, ill just show a picture of what i'm trying to achieve:

WhatsApp Image 2020-06-17 at 21.30.37.jpeg

how do I make the color of the "where the name of the site" is, so it will match the thyme of my store (mobile vertion)?

i'm using EcomSolid thyme

thank you, and sorry i didn't provide my own code. i don't even know how to ask this question