Overflow media

Hi,
I’m having difficulties with media I want to overflow to the left in Twenty Sixteen:
– Images are doing it only beyond 1280px of width.
– Videos aren’t overflowing no matter how big it is.

It can be checked at https://erickricco.com/blog.
Note that in post TEST the photo is set to 840px of width, so it should be overflowed. The video is 1920px of width and still shows with 600px.
In TEST 2 the photo does overflows, buttony because it’s set to 1280px of width.

So, I want all the media to expand like it should, from 840px wide.

Appreciate any help.