Make image "stick" on top of image beneath it

Hello,

Can you help me figure out how I can get an image to "stick" to the changing image beneath it? The top image needs to always be in the middle of the Instagram picture beneath it. The Instagram picture constantly changes as part of a slideshow. This is on the sidebar of http://www.houseofcindy.com/blog. See image attached.

The issue I am seeing is when the window is made smaller, the image that says "Follow on instagram cindyciskowski" isn't centered on top of the Instagram picture beneath it.

Thanks!