Images missing width limitations

Hi, i dunno if i put this in a right way, but fork needs this. When user uploads image on some module like slideshows or similiar and enters into edit view that view will be streched as long as image is, so you cant press save or other buttons easily it ruins whole edit page. Please take this notice this bug is very old.
Update structure.css

Identation fix.
Merge pull request #868 from vytenizs/patch-2

Images missing width limitations