Added google recaptcha and need dark theme

Used this code and it only dispays the white recpatcha box. Any way someone can show me how to use the dark them one? their are two choices with google and i cant see anywhere in this code to select that.

Thank you in advance.

function ava_custom_recaptcha(){
?>
<script type=”text/javascript”>
var createCaptcha = function() {
var button = jQuery(“.avia_ajax_form .button”),
parent = button.parent(“.form_element”);
captcha = jQuery(“<p id=’reCAPTCHAV2′></p>”);

button.attr(“disabled”, “disabled”);
captcha.insertBefore(parent);
};

createCaptcha();

var onloadCallback = function() {
var publickey = ‘YOUR PUBLIC API KEY’;
grecaptcha.render(‘reCAPTCHAV2’, {
‘sitekey’ : publickey,
‘callback’ : ‘onSuccessfullCallback’
});
};

var onSuccessfullCallback = function() {
jQuery(“input[type=submit]”).removeAttr(‘disabled’);
};
</script>
<?php
}
add_action(‘wp_footer’, ‘ava_custom_recaptcha’);

if(!function_exists(‘avia_register_reCAPTCHAV2_scripts’))
{
if(!is_admin()){
add_action(‘wp_enqueue_scripts’, ‘avia_register_reCAPTCHAV2_scripts’);
}

function avia_register_reCAPTCHAV2_scripts()
{
$prefix = is_ssl() ? “https” : “http”;
$api_url = $prefix.’://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit’;

wp_register_script( ‘avia-google-reCAPTCHAV2-api’, $api_url, array(‘jquery’), NULL, true);
wp_enqueue_script( ‘avia-google-reCAPTCHAV2-api’ );
}
}