I made a clear plastic box with white clear color. But the thing inside is (like the reverse face color)

[mange.drawing.123]

I prefer to have a white color total instead. I wonder how I can change it.

Thanks

[Box]

Because you have made the colour transparent you are seeing through to the back side of the faces. You need to paint the back faces with the transparent colour too if that is what you want.

[mange.drawing.123]

thanks. I got it