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Substack: wider article column

Widens the newsletter text column to about 780 pixels so long paragraphs read more comfortably.

Code to copy

/* Wider article column for long-form newsletters */
.single-post .post,
.post-content,
.body.markup,
article .available-content,
[class*="postBody"] {
  max-width: 780px !important;
  margin-left: auto !important;
  margin-right: 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.