Drupal

Code

<div class="field__item">
<div class="video-embed-field-responsive-video">
<iframe allowfullscreen="allowfullscreen" frameborder="0" height="480" src="https://www.youtube.com/embed/8TjL98FCf5w?autoplay=0&amp;start=0&amp;rel=0" width="854">
</iframe>
</div>
</div>

Video Output

After pushing a dev instance of drupal to a server, the admin CSS broke.

Browser Console showed *.css files that were obviously auto-generated, but no amount of browser cache clearing, CHMOD, or D8 cache clearing resolved.

Here's an excerpt from the D8 forums - with the actions that were taken noted with ***

The method that has worked for me in past is below:
There may be an unneccessary step of two , but I prefer safe over sorry.

Based off a YouTube video where setup and config is covered; made personal notes and screen captures; and trapped errors, troubleshooting and resolutions for any problems encountered.