Answered Responsive images in Tinymce/CKEditor?

Hi guys.
I've designed a blog for my client and I'm trying to figure out how to solve image responsiveness from the editor.

ON my plain HTML design, the images respond well enough - simply using css - however, in ModX, when using Tinymce, the image manager sets the image to a fixed width and height, overriding my css rules.

Any ideas on how to get past this? Other than not using the editor, since the client shouldn't have to edit in HTML...

Thanks

for Evo, i've created this little plugin:

https://forums.modx.com/thread/96984/responsive-images-plugin#dis-post-524731

http://www.tattoocms.it/extras/plugins/responsive-images-plugin.html

Thanks a million, Bruno. This looks like it will work perfectly!