How to increase height/width of rating indicator of SAPUI5 control?

Hello,

I am creating a SAPUI5 App, where I am using a rating indicator to get some feedback.When I am trying to use this rating indicator, it is coming with predefined width and height. I am unable to make the stars in indicator enlarged. Also by default it comes with grey color, I wanted to change that to with yellow border.

I tried using CSS style, but when i try to give a yellow border and also try to increase height/width a box gets created around the indicaor.

Is there any way to enlarge these starts within the indicator and also give it a border.

Thanks,

Akshay