Slideshow has a different IMG-Size on mobile and desktop, causing Problems (Pipeline Theme)

[TG42]

Hey Guys, currently I have a Slideshow with a few pictures on the Pipeline-Theme which are different sizes on mobile and desktop view. Its zooming into the pictures on one of them so the picture is always problematic regarding the mobile or the desktop view. 

Would be great if someone could find a solution so every picture I insert is perfectly fitting into the theme on both views. 

Page: goekhan-hanau.de 

I normally try to insert pictures that are as big as: 5184 × 3456

thanks!

[TG42]

 @Made4uo-Ribe could solve it! 🙂