At first, we remove the dummy tiles in HTML. We put those tile elements in HTML just to test whether the CSS visual part works. After getting rid of the temporary code for dummy HTML tiles, the #floor HTML element reverts to the following state with just the #player element:

<div id="game-scene" class="scene">
  <div id="floor" class="floor">
    <div id="player"></div>
  </div>
</div>

We are going to need the reference of the floor element. Let's put the following code in the runway.js file. It creates a new view object and refers to the #floor element with an object property:

// runway view
;(function(){
  var game = this.spaceRunner || (this.spaceRunner = {});
  game.view = game.view || {};
  game.view.floor = document.getElementById('floor');
}).call(this...