#board {
  display: grid;
  border: 1px solid lightgray;
  grid-template-columns: repeat(3, 130px);
  grid-gap: 0;
  background-color: moccasin;

  div {
    height: 130px;
    width: 130px;
    box-sizing: border-box;
  }

  .goal_white {
    border-left: 6px solid white;
    border-right: 6px solid white;
  }

  .goal_black {
    border-left: 6px solid black;
    border-right: 6px solid black;
  }

  .goal_white:nth-child(1) {
    border-top: 6px solid white;
  }

  .goal_white:nth-child(7) {
    border-bottom: 6px solid white;
  }

  .goal_black:nth-child(3) {
    border-top: 6px solid black;
  }

  .goal_black:nth-child(9) {
    border-bottom: 6px solid black;
  }

  div:nth-child(even) {
    background-color: darkseagreen;
  }
}