This example helps to show how the isolated areas of a Venn diagram can be filled / coloured.
It was created as part of this answer on TeX StackExchange.
Other options for creating Venn diagrams with multiple areas shaded can be found in the Overleaf gallery via the Venn Diagrams tag.
Here, we will introduce 13 stylish box design examples for your LaTeX document. The main package used in this example is tcolorbox and mathspec for better font selection. The rest of the packages in this project are optional.