https://www.valtech.com/insights/6-steps-to-retrofit-your-current-website-for-responsive-design/
https://www.w3schools.com/html/html_responsive.asp
https://catswhocode.com/how-to-make-a-responsive-website/
https://dzone.com/articles/convert-an-existing-non-responsive-website-to-resp
https://www.quora.com/How-do-I-code-an-already-existing-website-to-be-responsive