Contain VFX graph particles inside a gameobject

Hello, I'm fairly new to Unity. I'm trying to recreate a box filled with smoke. With the help of the VFX graph, I used a texture and imitated the effect of smoke. Now I am trying to contain it within a cube gameobject but unable to do it with a box collider.

My approach to this may be wrong and I would love to hear so if that is the case.