Change the border's color of a button in Unity3D

Question

I began to work with Unity3D since one month and I'm trying to do an application which contains a menu, composed by a panel and several buttons. At this moment, I'm trying to customize the menu, I change the fill color of the panel and buttons, but until now I could not change the border color of the buttons. There is any way to customize the border's color of the UI buttons? I would appreciate your help. :)

Answer 1

No, you can not change just border color. If you use default buttons, take a look at Source image. It is basically a grey square with black borders. So when you change color of image black color remains black. To customize buttons as you want you need either create nested UI elements:

or create sprites with colors you want and replace source image