# not work as expected
button_to "foo", "#", method: :post, class: "c..", style: "s.."
# => out put will be like:
# <form class="button_to" ...>
# <button class="c.." style="s..">
# </form>
By defining the css style like the below, the button can be aligned with other (normal) buttons.
form.button_to {
display: inline;
}