Since the notification bar is added inside of the active page, page specific styles may override how the iframe is rendered in an undesirable way.
I came across this when logging in an internal corporate web-app we're using which for some reason has a global css setting of `iframe { min-height: 349px }` because nobody anticipated that 3rd party DOM elements would be injected to the page.
This modification should have no impact other than negating these global styles.
