How to remove bottom scroll bar from my form

Underneath the credit card payment form on the right side of this page:

http://www.attainhousing.org/donating/

There is a grey bar. It looks like it changes color when hovered over. I have no idea what it is and when I try to inspect the element, I can't find out anything about it, except that it is inside the iframe. In fact, in Firefox, it won't even let me inspect it at all. I don't have any widgets in the form, and the really weird thing is that I have the exact same form on this page:

http://www.attainhousing.org/donation-form/

And there is no grey bar at the bottom.

Can you help me out here?

I have tested your website and gray bar that you are mentioning is scroll bar.

That is happening because form is responsive and and box where form is located is smaller than the form.

I think that it can be removed by Injecting Custom CSS. Inside of your Form Builder select Setup & Embed tab, then click on Preferences, then select Form Styles tab and inside of Inject Custom CSS field at the bottom of existing code paste this code:

.jotform-form {

  overflow: hidden!important;

}

After adding this code your form should look like this.

Hope this will help. Let us know if you need further assistance. 

Yes, that fixed it. Thank you so much.

You're most welcome. 

Please feel free to open a new thread here in the forum if you needed any assistance again.

Thank you.