[Theme: Panache] Can't make blog images auto size

Hi!

I can’t get my blog images to have “max-width: auto”. I want this so all pictures are probably scaled on both laptop/smartphone.

I seems like that the image width is set to 600px outside the css file. – Because when examine the code in the browser the “width: 600px” for images are under the element.style tag.

My problem is that I can not find where this code is written. And I really hope that some of you can guide me to a solution.

My site is here: https://www.krystalsalonen.dk and the blog is located under “Nyheder” in the menu bar.