Slider before and after inscribed in html?

Question

css

Hi people! Please tell me, the client has a taplink, you need to make a slider before and after, but in the taplink there is just an insert of html code.

I made the code but it doesn't work on the desktop version and on the mobile phone as it should, the arrow doesn't translate.

stands on this site https://taplink.cc/landing_nik
The fact is that taplink is a constructor, and you can place everything only in the html code section, so you have to enter standard codes in html

The code itself is here https://codepen.io/ nikita-judin/pen/xxVMrvg