body {
  text-align: center;
}

.warning-message-area {
  height: 30px;
}

.warning-message {
  width: 600px;
  height: 30px;
  margin: 0 auto;
  background-color: red;
  color: white;
  font-weight: bold;
  border-radius: 15px;
}

.board {
  width: 480px;
  margin: 0 auto;
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(8, 60px);
  border: solid;
  border-width: 1px 0 0 1px;
}

.square {
  width: 60px;
  height: 60px;
  border: solid;
  border-width: 0 1px 1px 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.stone {
  width: 52px;
  height: 52px;
  border-radius: 50%;
}

.dark {
  background-color: black;
}

.light {
  border: 1px solid;
}