Custom Resource Pack help

Hello, i need some resource pack help.
I've asked on the discord already but no luck so i might as well make a thread on here too.
So im making a Custom Resource Pack and my current issue is that the UI drop shadow renders above the HUD itself, anyone here more knowledgeable on resource packs have an idea on what i could do to remove the dropshadow like in the base WynnPack?
So far with my tinkering i've came to the conclusion that if i change the colors of the level indicator it breaks and gives it a shadow despite the original not having any, which would be consistent with how some buttons work but there isnt any color palettes for the hud unlike the buttons. Its not an easy question but im kinda losing it by now with how much time i've spent trying stuff.

Screenshot taken on a Vanilla client


Screenshot taken with Immediately Fast mod


My question is if there is a method to fix this issue on vanilla?
Would be really nice if i could get this to work without the use of mods

Thank you in advance.