enfold change background color in video slideshow

@Mike : seems to be all 16/9 videos – must be something different .
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and by the way – why did you do it this way? ( via slider)
you can combine all your videos in one youtube playlist – without generating a playlist on youtube. ( this will be the best way – because i think the transitions between those videos are gone).

this could be for your videos an iframe code:
<iframe src="https://www.youtube-nocookie.com/embed/sATEt-81AT8?enablejsapi=1&ecver=2&controls=0&cc_load_policy=1&rel=0&showinfo=0&autoplay=1&color=white&iv_load_policy=3&loop=1&playlist=QU0MCwH9cIU,f7Oy2fySTHM,DWRUW1oSLxI,JGt8g7Ms0zA,PGrBLAci8tQ,SlEXdbUgMuQ,kjA-GLzPMfQ,X-qPTwLUBAM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

you see the first video is single – and at the end there are comma separated the other VideoIDs.

now to your setup to get a responsive youtube setup:
click to enlarge:

put this into your page on top in a code-block element and give to the code-block element a custom-class: fullvideo

<div class="avia-video avia-video-16-9" itemprop="video" itemtype="https://schema.org/VideoObject">
<div class="avia-iframe-wrap">
	<iframe src="https://www.youtube-nocookie.com/embed/sATEt-81AT8?enablejsapi=1&ecver=2&controls=0&cc_load_policy=1&rel=0&showinfo=0&autoplay=1&color=white&iv_load_policy=3&loop=1&playlist=QU0MCwH9cIU,f7Oy2fySTHM,DWRUW1oSLxI,JGt8g7Ms0zA,PGrBLAci8tQ,SlEXdbUgMuQ,kjA-GLzPMfQ,X-qPTwLUBAM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
</div>
</div>

go to your functions.php of your child-theme and insert:

function youtube_full_width_with_shortcode(){
?>
<script>
(function($){
   $('.fullvideo').closest('.content').css( 'padding' , '0px' );
   $('.fullvideo').closest('.container').css({"max-width": "100%", "padding": "0" });
   $('.fullvideo .avia-video').css('margin-bottom', '0px' );
   $('.fullvideo .avia-iframe-wrap').css('margin-bottom', '0px' );
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'youtube_full_width_with_shortcode');

see Result: https://webers-testseite.de/youtube-playlist-embed/

if you like to have the controls you can delete this parameter from the code-block element code
&controls=0

maybe instead add the &playsinline=1 parameter – this is for the ipad / iphone background option.