Align post content on mobile under 600px

[Meneguini]

What happened:
When viewing posts on mobile under 320px, any large image will appear beside the post title.

What should have happened:
The post's content should be aligned to avoid appearing beside the title of the post.
How to reproduce it (as precise as possible):
Set the screen's width to 320px, or choose iphone5/SE on Chrome's responsive mode.

Anything else we need to know?:

Environment:

• OS:

• Browser:Chrome