Provides an opaque background for [Control] children. Panel is a [Control] that displays an opaque background. It's commonly used as a parent and container for other types of [Control] nodes. https://godotengine.org/asset-library/asset/520 https://godotengine.org/asset-library/asset/516 https://godotengine.org/asset-library/asset/523 The style of this [Panel].