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Slack: show message toolbar only on hover

Hides the message action toolbar and reveals it smoothly only when you point the cursor at a message.

Code to copy

/* Keep the message hover toolbar hidden until you point at a message */
.c-message_actions__container {
  opacity: 0 !important;
  transition: opacity 0.12s ease !important;
}
.c-message_kit__hover:hover .c-message_actions__container,
.c-message_kit__background:hover .c-message_actions__container {
  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.