How do I get my main image to stretch the full length of the screen?

You learned a valuable lesson: do not mess with the original theme files. Learn how to build a child theme and you will always be able to return to the original, working theme if any accidents happen.

So, to answer your question ‘can someone take a look?’ – yes, someone probably could, but that would just help you out until the next time you make a mistake.

The best way to approach this is reinstall the original Twenty Sixteen theme and redo your adaptations in the correct, child theme way.

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