Assume I have this image, which is a background of a div:

Assume the div is:
<div id="my-roulette-button">
    <!-- content would be here -->
</div>
styled like this:
#my-roulette-button {
    width: 286px;
    height: 286px;
    background: url('myimage.png') center center no-repeat;
}
What I want to do is style the inner "button". The "button" I'm talking about is the inner -wooden- button-like circle with the "GIRAR" label (which is part of the image).
Even if I put the shadow in another image, and another DOM element I'm facing the same problem: styling a circle (instead of styling a squared, containing, region).
My question is: how could I style the inner circle? which element/styles should I apply? If it is possible, my intention is to:
- apply a :hover
- apply an ng-click (angular)
- apply a cursor pointer
I don't need help on how to do these 3 stylings, but how to detect a circle and apply styles to it.
Is it possible?
