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Claude: sticky message composer

Pins the composer to the bottom of the window and enlarges it for writing longer prompts.

Code to copy

/* Pin the composer and give the textarea more height */
[data-testid="chat-input-container"],
fieldset:has(div[contenteditable="true"]) {
  position: sticky !important;
  bottom: 0 !important;
  z-index: 30 !important;
}
div[contenteditable="true"] { min-height: 64px !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.