snake.css

.row { padding: 0; margin: 0; height: 12px}
.cell { 
  width: 10px; 
  height: 10px; 
  padding: 0;
  margin: 1px;
  display: inline-block;
  background-color: white;
}
.snake { background-color: green }
.apple { background-color: red }
.game {
  padding: 5px;
  box-shadow: 0 0 5px lightgray;
  display: inline-block;
  clear: both;
}