iOS/Android: Best practise for adding a back button on top of an either dark or light image

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Challenge: Creating a back button that is placed on top of an image that can either be dark or light WHILST keeping the style/layout in line with the current layout for headers.

Ask: Help with either ideas or suggestions to inspiration.

I've added the current layout for some headers as a baseline for helping with potential inspiration. Header option A is used as dropdown; Header option B and C is used as back buttons.

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