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Expand video to full width

Stretches video players and embedded frames to the full container width with a 16:9 ratio.

Code to copy

/* Make video players stretch to the full width of their container. */
video,
iframe[src*="player"],
iframe[allow*="fullscreen"] {
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  aspect-ratio: 16 / 9;
}

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.