Wordpress Header changing,Im very beginner of wordpress : Im Asp.net Core developer in my company, but our wordpress developer has some problems so they give me his job to me, and i dont have any wordpress experience, please help.
My problem is that our website design header is transperent when you are entering at site.

but when you scroll down header changes and becomes background white
I want to my header be always like second time when you scroll down, i want white background for header. Please help me guys.
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