I like to try and keep each one in its own segment as it helps my simple mind keep up with what is what.
Code:
/* ****** THIS CODE MODIFIES THE LIKES BAR BELOW A POST ***** */
/* Define Like summary color username */
.likesSummary .username {color: white !important;}
/* Define this segment name */
.likesSummary a {color: white !important;}
/* Define this segment name */
.likesSummary {color: white !important;}
/* Define background for like Summmary */
.likesSummary {background: #726C60 url('@imagePath/xenforo/gradients/threadview-bg.png') repeat-x top !important;}
It makes it a little easier when I have to go back in to modify or clean something out.. I know immediately what it refers to.
Edit: And it helps prevent exactly the problem that he had.