Adicionar uma Class nos botões submit do Gravity Forms

// filter the Gravity Forms button type

add_filter("gform_submit_button", "form_submit_button", 10, 2);

function form_submit_button($button, $form){

// The following line is from the Gravity Forms documentation - it doesn't include your custom button text

// return "<button class='button' id='gform_submit_button_{$form["id"]}'>'Submit'</button>";

// This includes your custom button text:

return "<button class='button et_pb_button' id='gform_submit_button_{$form["id"]}'>{$form['button']['text']}</button>";

}