Hooks to hide labels, and turn input into a button and add a class to it
// gravity form styles
add_filter( 'gform_enable_field_label_visibility_settings', '__return_true' );
function form_submit_button( $button, $form ) {
return "<button class='green_border_button' id='gform_submit_button_{$form['id']}'><span>Submit Form</span></button>";
}
add_filter( 'gform_submit_button_1', 'form_submit_button', 10, 2 );