Making an element responsive

Your theme isn’t supported here, as stated in your previous threads
https://www.ads-software.com/support/topic/removing-border-below-site-logo?replies=10
https://www.ads-software.com/support/topic/re-position-blockquotes?replies=4
https://www.ads-software.com/support/topic/adding-tags-with-some-css-formatting?replies=4

I know. I am asking in any other regards. Like how to add responsiveness to specific div items.

Then this is not a WordPress issue but a CSS issue.
Consider CSS-specific forums: https://csscreator.com/forum