Comment by xyheme

Thanks for your advice :)

I should improve the graphic design.

If I tell you the process of designing it, you may laugh at me.

The situation is when I am not sure about how to design some graphic, I just put a square button at some corner to bear the functionality :p

I think I am just start learning about graphic design, I am reading a book called "Graphic Design Manual: Principles and Practice" by Armin Hofmann (a book first published at 1965!)