how to create a HUD which turns part of screen to red on damage?

I want to create a Heads Up Display with a health system similar to Tomb Raider 2013 or Resident evil revelations where part of screen (on the corners) turns red to show the amount of health remaining (or damage taken) by the player instead of a health bar.

I was somewhat able to achieve this with Vignette effect which comes under image effects with unity but the problem is i can’t change the color it displays on the corner to red…

Please help me to create such a HUD.

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