Images Not Responsive For Easy Blog Posts

We have noticed that when a client adds images into their Joomla Easy Blog (http://www.sjallenlaw.com/blog-news), the images aren't responsive. When you inspect the element, the image width and height of the original size are still there, even though there is a max-width added to the default blog style.css

#ezblog-body .blog-text img, #ezblog-body .blog-content img {
max-width: 100%;
height: auto;
}

Is there a way to make all images responsive, even for the images that the client uploads into blog articles through the visual text editor -> insert media?

Thanks for your time.