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Gmail: comfortable reading width

Caps the message body at about 820px and centres it so text lines stay short and readable.

Code to copy

/* Constrain message body to a comfortable reading width */
.a3s.aiL, .ii.gt {
  max-width: 820px !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.