body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 10px;
  text-align: center;
}

.controls {
  margin-bottom: 10px;
}

#board-container {
  position: relative;
  display: inline-block;
  border: 2px solid #333;
  background: white;
  max-width: 100%;
}

#board {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 80px);
  width: auto;
  height: auto;
}

#board-container:fullscreen {
  background: #f4f4f4;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
}

#board-container:fullscreen #board {
  max-width: 100vw;
  max-height: 100vh;
}

/* Pions */
.pawn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  position: absolute;
  cursor: grab;
  border: 2px solid #000;
  user-select: none;
}

.pawn:active {
  cursor: grabbing;
}