If you want to have a better behavior when you change the size. you can take a look on this website. This tool can help you generate fluid space.Fluid Responsive Design | Utopia.
If you want to take a moment and read it, you can find some informations to help you. It is a very interesting website, it explain you how to create a better responsive design with dynamic padding, margin...
And you should try to make your website with a mobile-first approach.freecodecamp.org. .I find it's easier to use this way.
Hope to be helpful.
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