Hi, give the below a try, it may not be exactly what you are looking for, but may help to point you in a possible direction. Without knowing what kind of custom code that site is using, it is hard to say, it could be any kind of custom code solution. Webflow does not have this element that you can add from the Designer, but maybe in the future.
Step 1: Create a Div on your page, with the Unique ID set in Settings Panel, to “slider”
Step 2: Go to Site Settings → Custom Code
Step 3: Add this code to your Before Body section of your page:
Hi, that code should work in the Before Body section, and normally you should put all your javascript references in the Before Body section (whenever possible) but I made a typo in the code, so I have corrected that.