No, mis-understanding - I made a *screen shot* of the web page with the rectangle/border that I'd like to reproduce (I'm guessing in CSS) - I put a red line around the rectangle in the image so you can see which rectangle I'd like to reproduce.
You need to make a graphic that has a gradient on it that goes from the first color to the second color. It doesn't have to be that wide of a graphic. Just make sure the background color of the element you want to use it on matches the background color of the second color in the gradient.
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