Need help with UI transition

  1. What do you want to achieve? Keep it simple and clear!
    making an iris out effect.
  2. What is the issue? Include screenshots / videos if possible!
    I have no idea how to script UI
  3. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
    Trying to find stuff on the forum
    –Also i want the effect to trigger using Humanoid.Died

I have already made the main transparent circle with a black backround.
it looks like this, V2 of iris out