These few lines lines of CSS will outline every element with a border, up to 8 levels. Add more lines if your CSS elements go into a higher depth.

1. * { outline: 1px dotted red }
2. * * { outline: 1px dotted green }
3. * * * { outline: 1px dotted orange }
4. * * * * { outline: 1px dotted blue }
5. * * * * * { outline: 1px solid fuchsia }
6. * * * * * * { outline: 1px solid teal }
7. * * * * * * * { outline: 1px solid indigo }
8. * * * * * * * * { outline: 1px solid brown }