Align your videos
It's a good idea to keep videos the same width for alignment. 640 x 360 pixels is a good size but you can whatever size you prefer. Here is an online aspect ratio calculator Links to an external site. for convenience.
To change the size of you videos, you will need to click on the HTML editor and look for width and height specifications. Just change the numbers to whatever you have decided, switch back to the Rich Content Editor to check and then Save if you are satisfied.
HTML Code View:
<p><iframe src="//player.vimeo.com/video/14442392?title=0&amp;byline=0" width="640" height="360" allowfullscreen="allowfullscreen" webkitallowfullscreen="webkitallowfullscreen" mozallowfullscreen="mozallowfullscreen" data-mce-fragment="1"></iframe></p>
<p><iframe src="//www.youtube.com/embed/cukSqNoVWao?rel=0&controls=0&showinfo=0" width="360" height="240" allowfullscreen="allowfullscreen" allow="autoplay; encrypted-media"></iframe></p>
<p><iframe src="https://www.youtube.com/embed/nJn8SS83LDI?rel=0&controls=0&showinfo=0" width="560" height="315" allowfullscreen="allowfullscreen" allow="autoplay; encrypted-media"></iframe></p>