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Trello: dim done-looking cards

Fades cards with a completed checklist using transparency and grayscale.

Code to copy

/* Dim cards that look complete (have a completed checklist) */
[data-testid="trello-card"]:has([data-testid="card-checklist-badge"][title*="/"]),
.list-card:has(.badge.is-complete) {
  opacity: 0.5 !important;
  filter: grayscale(0.4) !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.