How to remove dark haze around bottom of images?

Hello, When you click on a media file for example in a gallery the image pops up larger but has this darker haze towards the bottom of the image, how can I remove that? Thank you in advance

https://statuecollecting.com/

Thanks for the reply but that does not fix the problem I need to resolve.

If you click onto any post, I have many a gallery of many pictures of said statue.

When you click to enlarge the image it blows up into a fullsize image that has this annoying black haze towards the bottom of the image. The top of the image is crystal clear but the bottom isn’t. Please how do I remove this bottom darkness in the images when viewing them?

You can clearly see it in every single image in the entire website, even on the front page you see the image clear from top to middle but once you look at the bottom of the image it goes darker. How do I make every single image on the website crystal clear to see without any effects.

It seems to be some sort of effect that needs to be disable or removed.

https://statuecollecting.com/silver-surfer-maquette/

Check the silver surfer post as it clearly shows this effect of the images going darker the lower you view it. Click on any of the images with a whitish background and look towards the bottom when it pops up in a larger image you can see this darkening effect towards the bottom. Please help

Thank you for the reply Vlad, that fixed the issue on viewing the images in the post itself.

But how do put the opacity to 0 on the images shown as a featured image on the front page? Thanks for helping me out in advance.

Thank you very much gentlemen, I greatly appreciate the help. Have a wonderful day.