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Trello: highlight overdue cards

Outlines in red and tints any card whose due date has already passed.

Code to copy

/* Strongly highlight cards with an overdue date badge */
[data-testid="trello-card"]:has(.badge.is-due-now),
[data-testid="trello-card"]:has([data-testid="card-due-date-badge"].is-overdue),
.list-card:has(.badge.is-due-now) {
  outline: 2px solid #e5493a !important;
  outline-offset: -2px !important;
  background: rgba(229, 73, 58, 0.12) !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.