Multiple comparison slider

Good morning,

please i need help. I would like to make a page with several comparison sliders. my site is in html5 css without CMS.
I found this slider that suits me. but I can’t duplicate it:

https://codyhouse.co/demo/image-comparison-slider/index.html

Thank you for your help

Nikola Tesla’s nephew

i duplicate :

function checkLabel(container) {
        container.each(function(){
            var actual = $(this);
            updateLabel(actual.find('.**cd-image-label**[data-type="modified"]'), actual.find('.cd-resize-img'), 'left');
            updateLabel(actual.find('.**cd-image-labe**l[data-type="original"]'), actual.find('.cd-resize-img'), 'right');
        });

        resizing = false;

and rename :

.**cd-image-label 2