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Don't post code snippets out of context in the forum. Create a small build on github that reproduces your problem. Guess (I should not have to guess): I am not familiar with that method, but looking at the code it takes an ARGB value not an RGB So I guess your alpha value is zero and the blending/transparency means nothing is displayed? See for example, Gui.drawBackdrop() or displayScoreboardSidebar() which also has code to take into account the user's choice of background opacity.