Page color and do not block header

I know that in order to set a specific page with page color in word, I need to use a workaround where I draw a rectangle filled with color and then stretch to fill the entire page and set it to hide behind text.

I did that but this page also has a header where it shows the name of company and then next row is just a long black rectangle.   The black rectangle was set to "tight".

but now I have a problem because "page color" rectangle does not block content in the page but it block the header (both text and black rectangle).  I don't understand why it is blocking both the text and shape in the header.  How can I fix this?