Responsive SVG animation w. vanilla Javascript

"Codepen" - https://codepen.io/ - is a social development environment - an online code editor for developers of any skill - that allows people to write code in the browser, and see the results of it as they build. Codepen is particularly useful for people learning to code.

Code layout for my animation https://codepen.io/steinarV/pen/qBKPGmK :

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