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Gmail: collapsible left label rail

Shrinks the left label rail to a thin icon strip and expands it only on hover to free up space.

Code to copy

/* Collapse the left label rail until you hover it */
.aeN { width: 56px !important; overflow: hidden !important; transition: width .15s; }
.aeN:hover { width: 256px !important; }
.bkK > .nH { margin-left: 56px !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.