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Stack Overflow: hide the entire right sidebar

Removes the right column with ads, related questions and widgets, then stretches the post content to full width.

Code to copy

/* Hide the entire right sidebar and let the main column take its place */
#sidebar {
  display: none !important;
}
#mainbar {
  width: 100% !important;
  max-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.