Without top:0;left:0, Firefox and other non-Chrome engines place
absolute elements at the content edge (padding offset = 20px) before
the JS transform is applied, shifting slots 20px below/right of cards.
Cards already had explicit top:0;left:0; slots now match.
.recycle-label also had top:50%;left:50% which combined with the JS
inline transform would place the ↺ symbol halfway across the board.
Changed to top:0;left:0 so JS transform is the sole position source.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
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