Ok, let's analyze this....
You want to change a CSS rule on your code.
I asume you want to do it as a response to something that happens in the browser...
Change physically the line in the CSS file is not impossible, but I supose that it isn't what you are looking for.
The best option, probably would be to change the CSS style through javascript as a reaction to the event or situation that makes you want to change the style. Using jquery:
$(".rating-container").css("color", "#f0f");
As an alternative, use different CSS classes for different element states and just change classes into your js code:
$("#myAffectedElement").removeClass("oldColorClass");
$("#myAffectedElement").addClass("newColorClass");
This will allow you to modify directly individual elements styles instead of changing every originally classed element.