code: function Background(width = 0, height = 0, radius = [0, 0, 0, 0]) {
  	THREE.Mesh.call(
  		this,
  		new BackgroundGeometry(width, height, radius),
  		new THREE.MeshStandardMaterial({
  			side: THREE.DoubleSide
  		}),
  		undefined
  	)
  	this.name = 'Background'
  	// Shadow SOM nodes are ignored during some layout calculations
  	this.shadowSOM = true
  }
docs: Background extends THREE.Mesh (an Object3D) and is used to render a background panel for a Three node.
  Unlike the DOM's background, this Background is designed to float a few centimeters behind the node's BorderLine.