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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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Add External Stylesheets/Pens

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML
!

CSS 

              
                body{
    background-color: #6b5757;
    background-image: url('../images/jungle_pic_2.jpg');
    background-attachment: fixed;
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: relative;
}

canvas{
    border: 8px solid #000000;
    border-radius: 10px;
    background-color: #bfee82;
    opacity: 0.7;
}
!

JS 

              
                window.onload = function() {
  //var canvas;
  var canvasWidth = 900;
  var canvasHeight = 600;
  var canvasStyleBorder = "18px solid rgb(218, 182, 182)";
  var blockSize = 20;
  var ctx;
  var delay = 100;
  var snakee;
  var applee;
  var widthInBlocks = canvasWidth / blockSize;
  var heightInBlocks = canvasHeight / blockSize;
  var score;
  var timeOut;

  init();

 

  function init() {
    var canvas = document.createElement("canvas");
    canvas.width = canvasWidth;
    canvas.height = canvasHeight;
    canvas.style.margin = "30px auto";
    canvas.style.display = "block";
    //canvas.style.backgroundColor = "#ddd";
    //canvas.style.border = canvasStyleBorder;
    document.body.appendChild(canvas);
    ctx = canvas.getContext("2d");
    snakee = new Snake(
      [[6, 4], [5, 4], [4, 4], [3, 4], [2, 4], [1, 4]],
      "right"
    );
    applee = new Apple([10, 10]);
    score = 0;
    refreshCanvas();
  }





  function refreshCanvas() {
    snakee.advance();
    if (snakee.checkCollision()) {
      gameOver();
    } else {
      if (snakee.isEatingApple(applee)) {
        score++;
        snakee.ateApple = true;
        do {
          applee.setNewPosition();
        } while (applee.isOnSnake(snakee));
      }
      ctx.clearRect(0, 0, canvasWidth, canvasHeight);
      drawScore();
      snakee.draw();
      applee.draw();
      timeOut = setTimeout(refreshCanvas, delay);
    }
  }




  function gameOver() {
    ctx.save();
    ctx.font = "normal 120px calibri";
    ctx.fillStyle = "#000";
    ctx.textAlign = "center";
    ctx.textBaseline = "middle";
    //ctx.strokeStyle = "#fff";
    ctx.lineWidth = 2;
    var centerX = canvasWidth / 2;
    var centerY = canvasHeight / 2;
    ctx.strokeText("Game Over", centerX, centerY - 170);
    ctx.fillText("Game Over", centerX, centerY - 170);
    ctx.font = "bold 70px calibri";
    
    ctx.strokeText(
      "Press SPACE to play again",
      centerX,
      centerY + 70
    );
    
    ctx.fillText(
      "Press SPACE to play again",
      centerX,
      centerY + 70
    );
    ctx.restore();
  }




  function restart() {
    snakee = new Snake(
      [[6, 4], [5, 4], [4, 4], [3, 4], [2, 4], [1, 4]],
      "right"
    );
    applee = new Apple([10, 10]);
    score = 0;
    clearInterval(timeOut);
    refreshCanvas();
  }




  function drawScore() {
    ctx.save();
    ctx.font = "bold 70px Arial";
    ctx.fillStyle = "#000";
    ctx.textAlign = "center";
    ctx.textBaseline = "middle";
    var centerX = 870 ;
    var centerY = 40;
    ctx.fillText(score.toString(), centerX, centerY);
    ctx.restore();
  }


  function drawBlock(ctx, position) {
    var x = position[0] * blockSize;
    var y = position[1] * blockSize;
    ctx.fillRect(x, y, blockSize, blockSize);
  }



  
  function Snake(body, direction) {
    this.body = body;
    this.direction = direction;
    this.draw = function() {
      ctx.save();
      ctx.fillStyle = "#3f241b";

      for (var i = 0; i < this.body.length; i++) {
        drawBlock(ctx, this.body[i]);
      }
      ctx.restore();
    };
    this.advance = function() {
      var nextPosition = this.body[0].slice();
      switch (this.direction) {
        case "left":
          nextPosition[0] -= 1;
          break;
        case "right":
          nextPosition[0] += 1;
          break;
        case "down":
          nextPosition[1] += 1;
          break;
        case "up":
          nextPosition[1] -= 1;
          break;
        default:
          throw "Invalid direction";
      }
      this.body.unshift(nextPosition);
      if (!this.ateApple) this.body.pop();
      else {
        this.ateApple = false;
      }
    };
    this.setDirection = function(newDirection) {
      var allowedDirections;
      switch (this.direction) {
        case "left":
        case "right":
          allowedDirections = ["up", "down"];
          break;
        case "down":
        case "up":
          allowedDirections = ["left", "right"];
          break;
        default:
          throw "Invalid direction";
      }

      if (allowedDirections.indexOf(newDirection) > -1) {
        this.direction = newDirection;
      }
    };
    this.checkCollision = function() {
      var wallCollision = false;
      var snakeCollision = false;
      var head = this.body[0];
      var rest = this.body.slice(1);
      var snakeX = head[0];
      var snakeY = head[1];
      var minX = 0;
      var minY = 0;
      var maxX = widthInBlocks - 1;
      var maxY = heightInBlocks - 1;
      var isNotBetweenHorizontalWalls = snakeX < minX || snakeX > maxX;
      var isNotBetweenVerticalWalls = snakeY < minY || snakeY > maxY;
      if (isNotBetweenHorizontalWalls || isNotBetweenVerticalWalls) {
        wallCollision = true;
      }
      for (var i = 0; i < rest.length; i++) {
        if (snakeX === rest[i][0] && snakeY === rest[i][1]) {
          snakeCollision = true;
        }
      }
      return wallCollision || snakeCollision;
    };

    this.isEatingApple = function(appleToEat) {
      var head = this.body[0];
      if (
        head[0] === appleToEat.position[0] &&
        head[1] === appleToEat.position[1]
      ) {
        return true;
      } else {
        return false;
      }
    };
  }



  function Apple(position) {
    this.position = position;
    this.draw = function() {
      ctx.save();
      ctx.fillStyle = "#ff0000";
      ctx.beginPath();
      var radius = blockSize / 2;
      var x = this.position[0] * blockSize + radius;
      var y = this.position[1] * blockSize + radius;
      ctx.arc(x, y, radius, 0, Math.PI * 2, true);
      ctx.fill();
      ctx.restore();
    };
    this.setNewPosition = function() {
      var newX = Math.round(Math.random() * (widthInBlocks - 1));
      var newY = Math.round(Math.random() * (heightInBlocks - 1));
      this.position = [newX, newY];
    };
    this.isOnSnake = function(snakeToCkech) {
      var isOnSnake = false;
      for (var i = 0; i < snakeToCkech.body.lenght; i++) {
        if (
          this.position[0] === snakeToCkech.body[i][0] &&
          this.position[1] === snakeToCkech.body[i][1]
        ) {
          isOnSnake = true;
        }
      }
      return isOnSnake;
    };
  }

  document.onkeydown = function handleKeyDown(e) {
    var key = e.keyCode;
    var newDirection;
    switch (key) {
      case 37:
        newDirection = "left";
        break;
      case 38:
        newDirection = "up";

        break;
      case 39:
        newDirection = "right";

        break;
      case 40:
        newDirection = "down";
        break;
      case 32:
        restart();
        return;
      default:
        return;
    }
    snakee.setDirection(newDirection);
  };
};
!
999px

Console