code: function (pairCode, linkUrl, includeStyles) {
  	/** @type {string} Pair code. */
  	this.pairCode = pairCode;
  
  	/** @type {string} URL for 'Connect' button. */
  	this.linkUrl = linkUrl;
  
    /** @type {Element} Overlay element. */
    this.el = document.createElement('div');
  
    /** @type {Element} Overlay stylesheet. */
    this.stylesheet = null;
  
    if (includeStyles) {
    	this.stylesheet = document.createElement('style');
    	this.appendStyles();
    }
  
    this.render();
  }
docs: Helper class for the canvas overlay, which has to be rendered and styled
  in JavaScript, just because.
  
  @param {string} pairCode
  * @param {string} linkUrl
  @param {boolean} includeStyles