Image will not span 100% and is not responsive

Hey Everyone,
I have tried a lot of different things to get this image to span the width of the page with no luck. I have tried making it a background image with various settings as well as placing the image in a section, in a div, etc. to no avail. I think I am coming at the problem from the wrong place. How would you code this to make this responsive/the best way to go about this?

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