Use a normal link to submit a form
Two ways. Either create a button and style it so it looks like a link with css, or create a link and use onclick="this.closest('form').submit();return false;".
You can't really do this without some form of scripting to the best of my knowledge.
<form id="my_form">
<!-- Your Form -->
<a href="javascript:{}" onclick="document.getElementById('my_form').submit(); return false;">submit</a>
</form>
Example from Here.