Select the Rounded Rectangle Tool (U) with a radius of 5 px to insert a button in the same zone with the menu on the site’s header.

The layer’s parameters: Blending Options>Inner Shadow

Blending Options>Gradient Overlay

Gradient’s parameters:

Blending Options>Stroke

Gradient’s parameters:

Make a copy of the button’s layer and choose the Free Transform selection to place the copy as in the picture from below. Change the parameters of the copies’ layers.

The layer’s parameters: Blending Options>Gradient Overlay

Gradient’s parameters:

Make two copies of the recently made button’s copy and select once again Free Transform option to place the new copies as below: