/* Persistent indication of the most recent move, including computer moves. */
#checkers-board .square.last-move-from {
  box-shadow: inset 0 0 0 4px rgba(255, 198, 88, .5);
}
#checkers-board .square.last-move-to {
  box-shadow: inset 0 0 0 4px #ffc65e, inset 0 0 18px rgba(255, 198, 88, .3);
}
#checkers-board .square.is-selected {
  box-shadow: inset 0 0 0 4px #ff9f2f;
}
#checkers-board .square.last-move-to .piece {
  filter: drop-shadow(0 0 5px rgba(255, 198, 88, .75));
}