.bi {
  width: 1em;
  height: 1em;
  vertical-align: -.125em;
  fill: currentcolor;
}

.container {
  min-width: 300px;
  max-width: 300px;
}

#board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  justify-content: center;
}

#board .cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 100px;
  border: 1px solid var(--bs-border-color);
  color: var(--bs-secondary-color);
  font-size: 3em;
  user-select: none;
}

#board .cell:nth-child(1) {
  border-top: none;
  border-left: none;
}

#board .cell:nth-child(2) {
  border-top: none;
}

#board .cell:nth-child(3) {
  border-top: none;
  border-right: none;
}

#board .cell:nth-child(4) {
  border-left: none;
}

#board .cell:nth-child(6) {
  border-right: none;
}

#board .cell:nth-child(7) {
  border-left: none;
  border-bottom: none;
}

#board .cell:nth-child(8) {
  border-bottom: none;
}

#board .cell:nth-child(9) {
  border-bottom: none;
  border-right: none;
}

#board .cell:hover:not(.disabled) {
  cursor: pointer;
  background-color: var(--bs-secondary-bg);
}