Why does a diamagnetic liquid form a meniscus in a magnetic field?

[gracy]

In this video
At time 2:34 to rest of the video there is a property(10th point) of diamagnetic liquid given.Same thing is written in my textbook also.I am really not getting this can anyone please explain or suggest any video demonstrating this.I have searched a lot on youtube.

 

[mfb]

The grammar looks odd. I think they just want to say "the surface of the liquid is lower in regions of strong field", with two examples of different places of strong magnetic fields.