Emded code is:
[space size="15px"]
<div class="video-fit">
<iframe width="640" height="360" src="https://www.youtube-nocookie.com/embed/lzcBnIwBQdU?rel=0&hl=en&cc_lang_pref=en&cc_load_policy=1" frameborder="0" allowfullscreen></iframe>
</div>
[space size="25px"]
For the "normal" page it is which is working nicely and responsive:
[space size="15px"]
[kad_youtube url="https://www.youtube.com/watch?v=lzcBnIwBQdU" width="640" height="360" maxwidth="640"]
[space size="25px"]