.grid {
  width: 200px;
  height: 200px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  border-style: solid;
}

.grid div {
  width: 20px;
  height: 20px;
}

.grid .snake {
  background-color: greenyellow;
}

.grid .apple {
  background-color: red;
}