iframe code to shorten second page of a form

I have embedded an iframe code on our webpage to display a form (broken up into three pages). I increased the height of the page in the code so visitors would not need to scroll.

However the second page of the form is shorter, so as a result there is extra space at the bottom (screencap attached). Does anyone know of a way to add code to accommodate that for the second page of the form.

It isn't a dealbreaker if isn't possible but thought to ask. Thanks in advance for any guidance anyone can provide!

Can you provide iframe code? We can test code easier

Here is the code - thank you!

<iframe src="https://survey.zohopublic.eu/zs/l0DXHb" frameborder='0' style='height:1900px;width:100%;' marginwidth='0' marginheight='0' scrolling='no' allow='geolocation'></iframe>

@tuanphan thanks so much again for the offer to help! I've pasted the the code above as requested. 

On 5/1/2024 at 2:12 AM, tuanphan said:

We can set fixed height for iframe, and can't set dynamic height based on content inside iframe.

Thank you so much for taking a look and confirming!