We are little confused on your requirement. Because the fix header background color is blue in default. Although if you want to disable position fix option in the header, Please follow the simple steps below:
Go to Dashboard > Appearance > Customize > Theme Options > General > Disable Fixed Header.
Simply, click on the checkbox and Click Publish.
E.g. Please visit this link http://www.craskills.in/services/ .
There you will see ARCHIVES: SERVICES on a grey coloured background / banner. I want that to be disabled in all my pages other than the home page (may be)… I’m not technically sound.
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