Before After Comparison Slider doesn´t work

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Hello everyone,
I'm trying to implement a Before After Slider on my homepage, but the codes don't work. I use the Debutify theme.

Here is the link to the homepage and password is hello18shop12536


On the homepage I created a "Custom Content" section and then inserted the HTML codes for the following pages in "Custom HTML".

I inserted the CSS codes in theme.css and the JS code in theme.js

But it just doesn't work. What am I doing wrong?    //This is the slider on the left at the website end, which doesn´t show a picture    //This is the big slider with the big picture in the middle