body {
  background: #0f172a;
  color: white;
  text-align: center;
  font-family: Arial;
}
.board {
  margin: 20px auto;
  width: 300px;
  height: 300px;
  background: gold;
  border-radius: 50%;
}
button {
  padding: 10px;
  margin: 5px;
}