Shulkerboxtooltip – Recommended & Proven

The preview window border usually matches the color of the Shulker Box (e.g., a yellow box has a yellow tooltip).

While primarily client-side, installing it on a server enables extra features like Ender Chest previews. Configuration and Links ShulkerBoxTooltip

Beyond Shulker Boxes, it can preview other containers like chests, furnaces, barrels, and even modded storage if they have been "picked" in creative mode. The preview window border usually matches the color