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X: focus mode for a thread

Widens and centres the main column and hides the sidebar to create a calm view for reading a thread.

Code to copy

/* Reading focus mode: widen the column and centre it on thread pages */
[data-testid="primaryColumn"] {
  max-width: 700px !important;
  margin: 0 auto !important;
}
[data-testid="sidebarColumn"] {
  display: none !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.