Name of the mod: Custom Selection Box Port
Url about it:
https://www.curseforge.com/minecraft/mc-mods/custom-selection-box-portWhy do you think it should be allowed: Custom Selection Box Port is a purely visual mod that allows the user to change the appearance of the block selection box (the thin black outline that appears when a player is looking at a block).
This mod would provide no unfair advantage, because it is only changing the appearance of the selection box, something that is already in-game. This mod would help users with large or poor quality display monitors where it's hard to see the current selection box. It also allows for more customization of Minecraft's appearance, to suit individual preference.
Thank you for taking the time to read and consider this!
Sample image: