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Wikipedia: sticky table of contents

Pins the side table of contents so it stays visible while you scroll through a long article.

Code to copy

/* Keep the table of contents visible while scrolling */
.vector-toc,
#vector-toc {
  position: sticky !important;
  top: 1em !important;
  max-height: calc(100vh - 2em) !important;
  overflow-y: auto !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.