Please use Hubspot HTML Embed Code then you can easily edit and set form style now you have you form third partry you can not overhide, under iframe style.
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@russellhawkins the problem seems to be around the button. It has extra padding around it. You'll need to set padding to 0 for the ".actions" class. I added a few screenshots and video below.
The spacing between fields is controlled by the "Input" class. Normally, you would set a margin-bottom to set this space—yours looks a little different. Do you have a link to the form to diagnose the problem?