Large Space Between Custom HTML block for email and other content

Is there some way to change the padding around the custom Html block? I use it for a Flodesk signup form, but there’s this huge gap between the form and the text.  I’ve looked around but I can’t see anywhere to make it smaller.  you can see it in the image I’ve uploded, or if it doesn’t work, it’s on this page: https://themintedfox.co/the-creative-biz-brief/ if you scroll down to the signup form.