Custom CSS button color

[Micah Freeman]

My goal is to change the color of the heart / like / favorite button.
I've got it partially working, the like button at the top of the page changes color when something has been liked, on hover and when mousing near / away from the button.
The buttons on videos display the new color if it's been liked and if hovering directly over it, but they display the default color when hovering close to the button / mousing away.

Here's my custom css:

/*Change rating button color*/
.ratingbutton-icon-withrating {
color: #38b000;
}

/*Change rating button color on hover*/
.btnUserRating:hover,
.favorite:hover {
color: #38b000;
}

Sorry if I don't know all the correct terms :P