I would like it same color as background is my goal
You do this in pretty much the standard way you change the color of most items:
In Layout mode, click on the object,
Go to the inspector, Appearance tab
Under Graphics, choose the option you want (for instance, Fill: None will make it transparent, so that you can see the background through the object).
In the top section of that tab (where you see Theme and Style) you can choose what exactly you're altering. For instance, you can change the color of the Slide's dots by selecting Slide Control: Dots
Play around with this a bit just to see what changes can be made to different objects.