Q:

get back unity default interface

i installed unity recently .and interface of unity looks like that  [see the image] in all tutorials i see on the internet. 

but this is my one(I'm not in the game tab I'm in the scene tab)it's look like brown and i don't like it.i want default interface the interface in first pic which is black .how can i get black interface back ? 

A:

Follow these steps

Select the main camera
Locate clear flag option in the inspector
Change the value from "Skybox" to "Solid Color"

Also 

Go to Window > lighting 
Scene tab
Skybox > change from "Default-Skybox" to "None"

