.grid {
  width: 440px;
  height: 440px;
  display: flex;
  flex-wrap: wrap;
  background-color: #d3d3d3;
}

#label {
  margin: 10px;
}

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

.snake {
  background-color: red;
}

.mouse {
  background-color: blue;
}

.border {
  background-color: black;
}