refa: article (#757)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/dynamics/opus_detail/container_size.dart

@@ -0,0 +1,16 @@
+class ContainerSize {
+	double? height;
+	double? width;
+
+	ContainerSize({this.height, this.width});
+
+	factory ContainerSize.fromJson(Map<String, dynamic> json) => ContainerSize(
+				height: (json['height'] as num?)?.toDouble(),
+				width: (json['width'] as num?)?.toDouble(),
+			);
+
+	Map<String, dynamic> toJson() => {
+				'height': height,
+				'width': width,
+			};
+}