Start creating a new file of header size. Create a rectangle using rectangular shape tool. Place it on the bottom.

Double click the layer to open layer style window. Apply settings as shown.

Create another rectangle using rectangular shape tool. Place it on the bottom.

Double click the layer to open layer style window. Apply settings as shown.

Duplicate both the layers. Press Ctrl+T. Right click and select Flip Vertical and place on the other side.

Create a rectangle using rectangular shape tool.

Double click the layer to open layer style window. Apply settings as shown.