#board {
  text-align: center;
}
.dot {
  margin: 5px 50px;
}
#lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
.outer {
  background-color: black;
  border-radius: 1em;
  font-size: 0.8em;
}
.possible {
  border: 5px solid yellow;
}
.red {
  margin-top: -10px;
  background-color: red;
  border: 5px solid red;
  border-radius: 10px;
}
.purple {
  margin-top: -10px;
  background-color: purple;
  border: 5px solid purple;
  border-radius: 10px;
}