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https://www.gravityhelp.com/documentation/article/gform_submit_button/

<?php

//put this in functions.php (do not copy the opening and closing php tags)

// filter the Gravity Forms button type
add_filter( 'gform_submit_button', 'form_submit_button', 10, 2 );
function form_submit_button( $button, $form ) {
    return "<button class='button' id='gform_submit_button_{$form['id']}'><span>Submit</span></button>";
}

?>