Anna Melnikova Interiors It was a spray-paint. Unfortunately, I cannot tell the exact name of the paint, since it was quite a long time ago. But you can take any spray paint for decorating purposes. For example, Molotow Premium Artists' Spray Paint in the color 'Light Riviera'.
But what is important to know is that only with a spray paint you can achieve an evenly painted surface for this kind of material (the back of the book shelf is a particleboard coated with ABS plastic). Do not take a regular paint that you use for painting the walls, as it will not stick to this kind of surface.

marvyn Thank You