Images are overlapping

Hey there. My custom images are overlapping whenever I add them, and I had the same problem hours ago and it was solved with adding a simple custom css as you can see in this title.
http://wordpress.org/support/topic/images-overlap-with-code-syntaxes-1?replies=7

However, it still continues when I add more images on my post. Could you please help ?. Thanks anyway

Also you can find my current site from here

http://buraktas.com