[Theme: Twentyfourteen] editor, images wrong

I’m using (latest version) Twenty Fourteen. I’ve made a child theme and it works fine. I’ve changed the default content width, images, header etc. from 474 to 800 (on all 7 instances of 474) and yet when I go to create a new post or edit a post, the max image is still 474. The layout in the editor is still very narrow too. Even if I custom size an image to (anything larger than 474) it still shows 474 in my editor (but the published post is correct).

Is there a separate CSS for the post editor? it’s annoying, kinda hard to get a feel of how the page is going to look before publishing.