#board {
  touch-action: none;
  display: inline-block;
  width: 100%;
  height: 100%;
}

.gameRow {
  display: flex;
  width: 100%;
  height: calc(100% / 8);
}

/* .gameRow:nth-of-type(1){
  border-top: 1px solid black;
}
.gameRow:nth-of-type(8){
  border-bottom: 1px solid black;
}
 */
#piece-area,
.square,
.piece,
#choose-promotion > .promotion-piece {
  width: calc(100vw / 8);
  height: calc(100vw / 8);
  max-width: calc(var(--board-vh-limit) / 8);
  max-height: calc(var(--board-vh-limit) / 8);
}

#piece-area {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
  pointer-events: none;
}

.square {
  font-size: 1.5vh;
  position: relative;
  display: flex;
  box-sizing: border-box;
  font-weight: bolder;
  touch-action: none;
}

.br-text,
.tr-text {
  position: absolute;
  user-select: none;
}

.square.incorrect > .br-text,
.square.correct > .br-text {
  right: calc(-1 * var(--square-border-width) + 1px) !important;
  bottom: calc(-1 * var(--square-border-width) + 1px) !important;
}

.br-text {
  right: 1px;
  bottom: 1px;
}
.tr-text {
  left: 1px;
  top: 1px;
}

.square {
  background-color: #dbb7b7;
  color: rgb(130, 65, 0);
}

.square.dark {
  background-color: #824100;
  color: rgb(219, 183, 183);
  box-sizing: border-box;
}

.avail-move {
  margin: auto;
  background-color: #a4ff3fc2;
  opacity: 80%;
  display: block;
  border-radius: 50%;
  border: 1px solid black;
  width: 20%;
  max-width: 2vw;
  height: 20%;
  max-height: 2vw;
  z-index: 0;
  touch-action: none;
  pointer-events: none;
}

.avail-move.hidden {
  border: none;
  width: 0;
  height: 0;
}

#board-with-promotion {
  position: relative;
  width: 100%;
  height: 100%;
}