CSS Z Index Playground
Preview overlapping boxes and z-index stacking order.
Understand stacking order
z-index only works within a stacking context, which is why elements sometimes refuse to sit on top no matter how high you set the number. This playground lets you overlap boxes and change their z-index so you can see the stacking order resolve in real time.
Watching the layers reorder builds the intuition that finally makes z-index predictable. Experiment with overlapping elements and their values, then take that understanding back to your real layout to fix a stubborn stacking bug.
Stacking, previewed
z-index only compares elements within the same stacking context, which is why a high value can still sit behind. The playground makes contexts visible in your browser.
Frequently Asked Questions
What does the css z index playground do?
It generates CSS from the options you choose and previews the result directly in your browser.
Can I use the CSS in production?
Yes. Copy the generated CSS as a starting point, then review naming, browser support, and design-system fit before shipping.
Does this upload my design values?
No. The generator runs locally in your browser and does not send your input to a server.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for front-end design and implementation work.