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YouTube: wider video player

Enlarges the standard watch-page player so the picture is bigger without switching to theatre mode.

Code to copy

/* Make the default (non-theatre) player noticeably wider */
ytd-watch-flexy[flexy] #primary.ytd-watch-flexy {
  min-width: 0 !important;
}
ytd-watch-flexy:not([theater]) #player-container-outer {
  max-width: 1100px !important;
}
ytd-watch-flexy:not([theater]) #player.ytd-watch-flexy {
  width: 100% !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.