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.
Private and instant
Everything runs locally in your browser using standard web APIs — nothing is uploaded, logged, or stored on any server — so the tool works offline, responds instantly, and keeps whatever you paste in on your own device. That makes it safe to use even for confidential, client, or internal data you would never send to an unknown website.
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.