Step 1
Open a New file with 500×500 px with black color on background.

Step 2
Take a Guide Lines for height and width, then click on rectangle tool. Draw rectangle shape with light gray color.

Step 3
Change the foreground color to #b0b0b0. Then click on pen tool under tools panel. Draw triangle shape as shown. Same like this we need to create other parts using pen tool. (Remember we need to create all shapes cut to cut. There should no space between one another. You can align it after created all 3 shapes .Using Direct Selection Tool you can align it)

Step 4
Select 1st shape. Change color of it to #e3e3e3 .To do that, go to layer > change layer content > solid color > set it to #e3e3e3 .Now we need to give inner glow effect to a shape, to do that go to layer panel > right click on selected shape > click on blending options. Blending option opens>under it > check on inner glow > change blend mode screen to normal > change color to #dadada. Under elements > increase size to 10 .Then click OK .