How do I make a skyblock client/mod

I've seen many video's on making Minecraft clients, but all/most of the skyblock clients have the same look, like there all using a template, for example, patcher and other clients all have that dark grey and greenish text, and alot of cheat clients like rosegoldaddons and shady addons all have

Skyblock - Items/Inventory – Badlion Support

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