Combine now all the layers composing the button in a group. Copy this created group three times and place everything the way it is done below: Change the colors on different ones in the groups’ layers for each of the button.



The yellow button
The lowest layer
Blending Options-Gradient Overlay



Gradient’s parameters:



The interior layer:
Blending Options-Inner Shadow



Blending Options-Gradient Overlay



Gradient’s parameters:



Blending Options-Stroke