Image on sidebar cut off

Hello,

When I post an image or opt-in in my sidebar it gets chopped off when you shrink the size of the browser window. How can I make the image shrink with the page and now get chopped off?

http://kaocoaching.com/2014/the-first-4-steps-to-your-simpler-stress-free-life/

(where is says free video download and the information below it)

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

 .sidebar img {
width: 95%;
}

Thanks & Regards
Gourav Shrivastava