text: let canvas = document.getElementById("snake");
  let context = canvas.getContext("2d");
  let box = 32;
  let snake = [];
  snake[0] = {
      x: 8 * box,
      y: 8 * box
  }
  let direction = "right";
  let food = {
      x: Math.floor(Math.random() * 15 + 1) * box,
      y: Math.floor(Math.random() * 15 + 1) * box
  }
  
  function criarBG() {
      context.fillStyle = "lightgreen";
      context.fillRect(0, 0, 16 * box, 16 * box);
  }
  
  function criarCobrinha() {
      for (i = 0; i < snake.length; i++) {
          context.fillStyle = "green";
          context.fillRect(snake[i].x, snake[i].y, box, box)
      }
  }
  
  function drawFood() {
      context.fillStyle = "red";
      context.fillRect(food.x, food.y, box, box);
  }
  
  document.addEventListener('keydown', update);
  
  function update(event) {
      if (event.keyCode == 37 && direction != "right") direction = "left";
      if (event.keyCode == 38 && direction != "down") direction = "up";
      if (event.keyCode == 39 && direction != "left") direction = "right";
      if (event.keyCode == 40 && direction != "up") direction = "down";
  }
  
  function iniciarJogo() {
      if (snake[0].x > 15 * box && direction == "right") snake[0].x = 0;
      if (snake[0].x < 0 && direction == "left") snake[0].x = 16 * box;
      if (snake[0].y > 15 * box && direction == "down") snake[0].y = 0;
      if (snake[0].y < 0 && direction == "up") snake[0].y = 16 * box;
  
      for(i = 1; i < snake.length; i++){
          if(snake[0].x == snake[i].x && snake[0].y == snake[i].y){
              clearInterval(jogo);
              alert('Game Over :(');
          }
      }
  
      criarBG();
      criarCobrinha();
      drawFood();
  
      let snakeX = snake[0].x;
      let snakeY = snake[0].y;
  
      if (direction == "right") snakeX += box;
      if (direction == "left") snakeX -= box;
      if (direction == "up") snakeY -= box;
      if (direction == "down") snakeY += box;
  
      if(snakeX != food.x || snakeY != food.y){
          snake.pop();
      }else{
          food.x = Math.floor(Math.random() * 15 +1) * box;
          food.y = Math.floor(Math.random() * 15 +1) * box;
      }
  
      let newHead = {
          x: snakeX,
          y: snakeY
      }
  
      snake.unshift(newHead);
  }
  
  let jogo = setInterval(iniciarJogo, 100);
  