Convert styles to inline

There are some styles in use for the canvas element, these need to be injected by the setup methods.

```
  <style>
    .canvas-wrapper {
      margin: 0 auto 0 auto;
      width: 500px;
      height: 500px;
      border: 2px solid black;
    }

    #gc {
      cursor: crosshair;
    }
  </style>
```
