Press the Alt button and make a mouse’s click between the flare’s layer and the buttons’ panel for the flare to be applied in the limits of the buttons’ panel.





Make a copy of the new made layer and move the copy with Free Transform option on the left side of the buttons’ menu.



Select now the Rectangle Tool (U) to paint the lowest part of the site’s background in here shown color - #1A1A1A



The layer’s parameters:
Blending Options>Outer Glow



Blending Options>Bevel and Emboss