Help with a breakpoint

I am doing a school project and am having trouble getting a certain breakpoint to work. I'm sure it is something simple and I just can't see it. This is my first month coding, tried to use chatGPT to help but the few suggestions through there seemed to make it worse or not change it at all. I am trying to get under 990px to be a single column with everything stacking vertically including my navigation. Going logo, nav, main content, then image. I do not want to use javascript or any...

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