t-align: center;
  }
  body {
    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  }
  canvas {
    border: 1px solid black;
  }
  </style>
  
  <script type="application/javascript">
    var canvas, ctx;
    var agentView = false;
    var humanControls = false;
    
    // Draw everything
    function draw() {
      ctx.clearRect(0, 0, canvas.width, canvas.height);
      ctx.lineWidth = 1;
      var agents = w.agents;
      
      // draw walls in environment
      ctx.strokeStyle = "rgb(0,0,