image border for image in page

When I use and image in the page it shown always a border which I don't like.
Now the same image in the header comes without border.
Can you please help me to delete the border and show the image without it.
Please note that the same image in the header has no border.

Please see the screenshot to better understand what I mean.

I grant you support access in case you wanna have a look.
This is the page where the image is: