Survey Form Background Image not working

Ive tried different ways that ive seen around the web to fix my background image problem. i just cant get the image to display at all. i want it to stretch the length of the page.I used dropbox for my image and will post the code used below.

here in the link to my pen

I thing the url is bad
Try this

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hmm that did work. do you know why i was unable to use the dropbox link? i was under the impression that we were unable to use hotlinks.