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Dim deleted lines in the diff

Slightly dims deleted diff lines to focus attention on the new code; hovering restores full visibility.

Code to copy

.blob-code-deletion, .blob-num-deletion,
[class*="DiffLine"][data-line-type="deletion"] {
  opacity: 0.55 !important;
}
.blob-code-deletion:hover,
[class*="DiffLine"][data-line-type="deletion"]:hover {
  opacity: 1 !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.