Colored rectangle.
Displays a rectangle filled with a solid [member color]. If you need to display the border alone, consider using [ReferenceRect] instead.
https://godotengine.org/asset-library/asset/515
The fill color.
[codeblock]
$ColorRect.color = Color(1, 0, 0, 1) # Set ColorRect's color to red.
[/codeblock]