If your embedded YouTube or other video is too large and does not fit within your current layout of your blog, simply go into the HTML and change the height and width parameters:
Old (too large): iframe allowfullscreen="" frameborder="0"
New (just right): iframe allowfullscreen="" frameborder="0"
(You can also play around with the height/width, this worked for me too: 289x460)
You may also have an option to change the size of the video while copying the embedding link. If so you can select a smaller size there.
Thanks to TaskRabbit, Kevin C.
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