From ScreenCast

The picture just below uses Screen Cast and the embed code is copy/pasted from ScreenCast. Makes no difference about changing the size in the code - it is BLACK BOXES top and bottom that are the issue.

<!-- copy and paste. Modify height and width if desired. --><iframe class="tscplayer_inline smart-player-embed-container-iframe embeddedObject" name="tsc_player" scrolling="no" frameborder="0" type="text/html" style="overflow:hidden;" src="https://www.screencast.com/users/Skybguy/folders/NewTemple/media/7f8676cd-024a-466b-9a20-7ba61085ac7a/embed" height="720" width="1280" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>

 

Code From YouTube

The movie just below uses the embed code from YouTube. No black boxes at all no matter what size the video is.

Otherwise the video is exactly the same in both cases. Th embed code is:

<iframe width="560" height="315" src="https://www.youtube.com/embed/wNLcqAEynyw?rel=0&amp;controls=0&amp;showinfo=0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

 

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