A simple modal. `Modal.Close` allows a `close` attribute to be passed in that will invoke when the close button (an `x`) is clicked. The Modal background will only take up the width and height of its parent component. You can also provide `width` and `height` attributes on the `Modal` class, for custom width and height. `noBackground` will remove the background.

```html
<div>
  <Modal>
    <h1>How easy is this?</h1>
    <h1>Very easy!</h1>
  </Modal>
</div>
```