Collider triggers only in center

Hi,

So I have 2 objects, an image and a mesh. I have put a rigid body on the image and a box collider on the mesh. I am moving the rigid body with velocity. if the two objects collide nothing happens, the rigid body just goes on. But if I put also a box collider on the rigid body then the two objects will collide but the rigid body will always stop in it's center so not at the edges of the two box colliders. I have tried lots of different approaches but this is the only thing that works closest to what I want. What should I do to have the colliding triggered at its edges?

If it matters I am using 2d objects and 2 scene in unity 5.5

Thanks.