New feature Elements

Hi there,
Yesterday I added some code on Element/Hook (entire site >> because it is a landpage) to show a facebook chat and now it looks with a new scroll bar on bottom with white spaces on the right. Could you help us?

<!-- Load Facebook SDK for JavaScript -->

<script>
window.fbAsyncInit = function() {
FB.init({
xfbml : true,
version : 'v4.0'
});
};

(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = 'https://connect.facebook.net/es_ES/sdk/xfbml.customerchat.js';
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

<!-- Your customer chat code -->
<div class="fb-customerchat"
attribution=setup_tool
page_id="119133026144055"
theme_color="#974fd9"
logged_in_greeting="Hola, ¿podemos ayudarte?"
logged_out_greeting="Hola, ¿podemos ayudarte?">