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Wikipedia: collapse the reference list

Shrinks the long reference list and places it in a scrollable box so it no longer fills half the page.

Code to copy

/* Shrink and scroll the long reference list */
.mw-parser-output .reflist {
  font-size: 0.78em !important;
  max-height: 22em !important;
  overflow-y: auto !important;
  border: 1px solid #e0e0e0 !important;
  padding: 0.6em !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.