rangeslider.js not shown correctly in popbox

Hello,

The Problem I have is:
The rangeslider is not rendering correctly like the way it does on the website https://andreruffert.github.io/rangeslider.js/
It stays exactly like an ugly default html input type=”range” slider. This issue occurs only in the popbox itself, when i click on the previw link in elementor or open the popbox-website, then the slider is shown correctly.

Here it’s shown correctly:
https://rokvic.at/elementor-popup/konditionen/

Here it is not shown correctly (click on the Link “bestm?gliche konditionen” to open the popbox):
https://rokvic.at/#leistungen

hope you can help me, thanks in advance!

BR
bruce

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