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DEV banner on localhost

A blue bottom bar marking the local development environment running on localhost.

Code to copy

body::before {
  content: "DEV \2014  localhost";
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 99999;
  background: #458588; color: #fff; text-align: center;
  font: 700 11px monospace; padding: 4px;
  pointer-events: none;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.