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I find it difficult to be responsive, it is only a web page and not a mobile-friendly page. How can I learn more about CSS and do I need to learn framework?

This is my first time taking the challenge here, I find it difficult to center the content as I have only a little knowledge of CSS. I am not sure about the width and height of what I did. I will take more challenges here to challenge myself. I took this challenge for atleast 4 hours.