How to make embedded you tube video size responsive

Hello, I'm having a problem with the videos that I have embedded on the home page of my website. They look ok on a computer screen, but on smaller devices like phones and small tablets, they can not adapt/ respond to the size of the screen. This makes much of the video being off the screen.
I've heard you can add a div container to the CSS but was wondering if anyone has any advice on how to do this.
The home page address is http://ift.tt/1mdppoM
Please take a look. Any help would be...

How to make embedded you tube video size responsive

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