How to create a 'Welcome' first step that's centered in the browser window?

[trevorbehnke]

I've tried using the body tag, but that causes the page to jump. So, I created an almost working solution by using a dummy element that doesn't actually exist. Then I've centered the modal in the UI programmatically. This works fine, except there is a little white circle in the upper left corner of the browser window because the tour step is attempting to highlight something that doesn't exist. Is there a way to solve this? Maybe by masking everything but the modal? Just an idea.