First of all we made a new duplicate layer.

We then went onto Adjustments, and went on levels, We clicked red then changed it to 0.
We then did the same but went on green, and blue. then did the same and changed the number to 0 which gave the background a cyan and red effect.
After this we then changed the settings to 'Screen' which made the layer a normal colour, then moved the first layer slightly down and to the right to create this look;










