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Only clients that do not cover the whole area of this window expose the color
-used to paint it. If you use a color other than black for your terminals, you
-most likely want to set the client background color to the same color as your
-terminal program's background color to avoid black gaps between the rendered
-area of the terminal and the i3 border.
+used to paint it.
Colors are in HTML hex format (#rrggbb), see the following example: