MC-Icons

background-image: url("https://mc-icons.netlify.app/icons/${id}.png");
background-size: contain;
image-rendering: pixelated;

Full example: tech-tree-explorer

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https://mc-icons.netlify.app/item_infos.json maps block/item id (in lower_snake_case) to its display name.

Block icons are from https://minecraft.wiki/w/Block
Item icons are from https://minecraft.wiki/w/Item