How to I move to the center of the screen in UV image editor?

The UV image I created to unwrap my model onto is stuck in the bottom of the screen. I’ve tried using control and shift to try and move down. And there are not view options that seem to fix it.

I can only see the UV image if I zoom out but I need it to be visible up close. How to I move the image back to center?

EDIT:
Hold down MMB Solved.

MMB drag or Home key on your keyboard