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never understood why this works on Graal, from an HTML perspective
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#XXXXXX is hex that translates to #RRGGBB, or red, green and blue values. However, there is a fourth value that Graal apparently supports: Alpha. #RRGGBBAA. When you type in centered it's actually reading the values CE, which is valid hex that converts to 206. You can actually just use #RRGGBBAA format instead, so #000000CE would work, or #00000044 for very slightly transparent and so on.