Start before/after slider at 33% - Beer Slider JS

Hi! I want to start my before and after slider at 33% instead of 50% (with the button not being in the middle). Been searching for a solution, but I can’t find any.

Does anyone have any answers? It’s built using this:

Here’s a read-only link:
https://preview.webflow.com/preview/refined-site?utm_medium=preview_link&utm_source=designer&utm_content=refined-site&preview=f897f3d4a2f01ff160eac1cc9f716c73&pageId=65649ce9afd6c0c2a19cdcd0&workflow=preview