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Facebook: distraction-free single-post view

On a single-post page, centers the content and hides the side columns for a calm view.

Code to copy

/* On a single-post page, center the post and hide side columns */
body:has([role="dialog"]) [role="complementary"],
[role="main"] [role="complementary"] {
  display: none !important;
}
[role="main"] {
  max-width: 720px !important;
  margin: 0 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.