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WhatsApp Web: sticky compose bar

Keeps the compose bar pinned at the bottom of the window with a subtle separating shadow.

Code to copy

/* Keep the message compose bar sticky at the bottom of the chat */
footer[data-testid="conversation-compose-box"],
footer:has([data-testid="conversation-compose-box-input"]) {
  position: sticky !important;
  bottom: 0 !important;
  z-index: 100 !important;
  background: var(--panel-background, #f0f2f5) !important;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.06) !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.