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Wikipedia: full-width thumbnails

Stretches thumbnails and their captions to the full width of the text column so images are easier to see.

Code to copy

/* Make thumbnails span the full reading column */
.mw-parser-output .thumb {
  width: 100% !important;
  max-width: 100% !important;
  margin: 1.2em 0 !important;
  float: none !important;
}
.mw-parser-output .thumb .thumbinner {
  width: 100% !important;
}
.mw-parser-output .thumb img {
  width: 100% !important;
  height: 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.