Recoloring Portion of Slide Template Help Needed

I am creating an interactive guide using slide layers and want to create varying colors for the title headers of each topic to correspond to the button the user will click to view the slide layer. I am having issues recoloring the title header of the select slide templates. When I go to format the slide template which is a .png file, it recolors the  entire background but not the header. Previously, I was able to change the color of the header area in my slide template without recoloring the entire background, but it's been quite sometime since I've done it. How do I format the color so that I am only recoloring the Title area and not the entire template?

Thanks for any help!!

Best,

Dominique

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