In the meantime I’ve set up a CSS rule for that. Hopefully this is ok with the TOS.
Importato da support.iubenda.com (topic #42000004158) · 
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Added in the next release, it will be up within a few days, thanks for the useful suggestion 
Since the new CSS never went live and having the button misaligned with the rest of the footer is quite ugly, I took the liberty of adding the same override to my local CSS.
I hope it doesn’t count as a breach of TOS