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Note that you can't use the British spelling, "colour", in this context. Examples: <span style="color:red">red writing</span> shows as red writing. <span style="color:#0f0">green writing</span> shows as green writing. <span style="color:#0000FF">blue writing</span> shows as blue writing.
RGBA color model. Example of an RGBA image composited over a checkerboard background. alpha is 0% at the top and 100% at the bottom. RGBA stands for red green blue alpha. While it is sometimes described as a color space, it is actually a three-channel RGB color model supplemented with a fourth alpha channel.