body {
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  color: #68ba7d;
}
#board {
  width: 640px;
  height: 360px;
  background-color: #adffc2;
  border: 10px solid #68ba7d;
  
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}

#board img{
width: 211.3333333px;
  height: 118px;
  border: 1px solid #adffc2;
}