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Is there an alternative to using 100vh to define the container's size for flexbox? Something which will also cover the full width? I tried with 100% but that did not work?

I have used bootstrap to achieve responsive design. Can you point me into a direction what I have to look at in order to achieve the same without bootstrap?

My main challenge was to somehow center the main content horizontally. I have achieved this by applying different top margin, depending on the breakpoints. Is there a best practice how to achieve this?