<style>
.menubajo { width: 320px; height: 100px; }
@media(min-width: 500px) { .menubajo { width: 468px; height: 60px; } }
@media(min-width: 800px) { .menubajo { width: 728px; height: 90px; } }
</style>
<center>
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- menubajo -->
<ins class="adsbygoogle menubajo"
     style="display:block"
     data-ad-client="xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
     data-ad-slot="xxxx"
     data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script></center>