Rating stars second

Doesn't depend on width of star.
With BEM, since this is a child of ddm-rating-stars the class name should be ddm-rating-stars__star.

However, you may want to want to consider removing the presentation stuff from the class name such as stars. This widget could be displayed as circles, squares, diamonds, hearts, etc. It'd work no matter what the shape is. Better class names to make this more reusable would maybe be ddm-rating-widget and ddm-rating-widget__step.