Removing slider from embedded custom code element

I'm trying to solve the same problem that this user had: I've injected custom code for an online booking platform for a small hotel, but the booking widget that the code creates shows up in a small box with a slider, not in full. The widget is fully there, but only if you scroll down: you can't see the whole widget at once. Any ideas on how to fix it?

Hi,

Can you share link to page in screenshot? We can check easier