body {
  background: url("i/background.jpg");
  background-size: cover;
  font-family: Arial, Helvetica, sans-serif;
  color: white;
  text-align: center;
}

#board {
  width: 450px;
  height: 450px;
  background-color: lightblue;
  border: 5px solid slategray;
  border-radius: 10px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}

#board img {
  width: 50px;
  height: 50px;
}