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piece.rook.black{background-image:url(/piece/spatial/bR.svg)}.b64-board[data-pieces=spatial] piece.bishop.black{background-image:url(/piece/spatial/bB.svg)}.b64-board[data-pieces=spatial] piece.knight.black{background-image:url(/piece/spatial/bN.svg)}.b64-board[data-pieces=spatial] piece.pawn.black{background-image:url(/piece/spatial/bP.svg)}.b64-teach{position:absolute;inset:0;pointer-events:none;z-index:5}.b64-teach .tcell{background:var(--tc);border-radius:3px;opacity:0}.b64-teach .tcell,.b64-teach .tghost{position:absolute;width:12.5%;height:12.5%;left:calc(var(--c) * 12.5%);top:calc(var(--r) * 12.5%)}.b64-teach .tghost{background-size:84%;background-repeat:no-repeat;background-position:50%;opacity:.92;z-index:6}.b64-teach.reveal .tcell{animation:tReveal calc(3.2s * var(--tspeed, 1)) linear infinite;animation-delay:calc(var(--i) * .13s * var(--tspeed, 1))}.b64-teach.reveal .tcell.dest{animation:tDest calc(3.2s * var(--tspeed, 1)) linear infinite;animation-delay:calc(var(--i) * .13s 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