tutorial videos - how to make mobile responsive?

I have the Tutorial Videos installed on my site (http://usingwp.net).

I am using the embed code, not shortcodes.

However, when I view on mobile, they are not responsive.

How do I make them responsive?

If the answer is 'use the shortcodes' -- then how do I set the shortcodes to show full screen on desktop. I chose the embed code because I wanted the videos to show full-width on the desktop version. I changed settings to double the embed code settings (562 x 1000 instead of 281 x 500).

Thanks in advance for the help.

Jeff