Is there a particular reason to add a line break
to the widget (between the submit button and the
paragraph text) ?
I do not find the line break useful since the paragraph description already displays the text in it's own line. I had to manually add a display: none to the line break.
If it's not necessary, I'd recommend removing the line break tag from the plugin code. It creates a big space, especially for themes with high line-height values.