Make five copies of the last made layer and choose the same Free Transform option to change the copies’ sizes and copies’ placement (the same way it was described before).
The first copy has the white color:





The second copy:



The layer’s parameters:
Fill 0% on the layers:
Blending Options>Gradient Overlay



Gradient’s parameters:





The third copy:



The layer’s parameters:
Fill 0% on the layers.
Blending Options>Gradient Overlay