Why does the shadow appear on the png image?

Question

css

Can you please tell me why I insert images with a transparent background on the site, but it still stands out (the size of the image itself is smaller than the size of the image inserted on the site)? Look at the mobile version 800 px.
Link to layout: https://damruss.github.io/exp1/

Answer 1

There is a real shadow in the picture - in the picture itself. You can open it in fsh and see it.

Answer 2

what exactly to look for?