Dynamic RGBa Retheming

Hello there. The canvas below contains an RGB color space, which responds to mousedown, mouseup, mousemove, mouseleave, and wheel events. Holding LMB down on the canvas changes the selected color, sourced from the color space. Releasing LMB preserves the current selected color under the cursor. Scrolling up or down increases or decreases the transparency of the color space. This text's font color will change in response to the RGBa color selected on the canvas!

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