You can set or change the background color and image of the page header with Zakra.

Follow the steps as mentioned below:

From your WordPress Dashboard, go to the Appearance > Customize > Content >Page Header section.
Under the Background options, choose the Background Color or Background Image for the page header.
Click on Publish.

It is shown in the images below:

To set or change the background color or image for the page header of an individual page, refer to this article: How to change the color and background of the Page Header on an individual page? (Pro)
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