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Wikipedia: sticky top header

Pins the top bar with the search box and menu so it stays reachable while you scroll.

Code to copy

/* Keep the top header pinned while scrolling */
.vector-header-container,
.mw-header {
  position: sticky !important;
  top: 0 !important;
  z-index: 100 !important;
  background: #fff !important;
}

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.