How do i key out the background only in fcpx

I can keyout the background, but my subject has a green button that turns gold/yellow. I need this button to stay green. How do I key out only the background while leaving my subject normal?

In general, this happens when the alpha matte is slightly larger than the logo you want to key. That causes a bit of the background to show through in the key. The solution is to either shrink the alpha, or expand the logo.
Sometimes the alpha matte is fringed with grey, and if you change the grey to black (or white, depending on which is not the matte color), it'll fix this. But all that is situation dependent and I'm not saying there should not be grey pixels in an alpha channel ever. If you're creating a glow behind a title or a logo, you'll have greyscale pixels fringing the objects and the RGB background color will determine the glow color. (But I'm wandering aimlessly off topic, so I'll shut now.)

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