lolaaa on "[Plugin: Ridiculously Responsive Social Sharing Buttons] How to put a background color in share container clearfix"

Where in the rrssb.css files, would I put a background color?
I did it like this but not showing up prop when I view it on a Blackberry mobile phone device but fine on Google chrome. Not sure I'm doing correctly.

}
div.share-container.clearfix {
float: left;
margin-top: 75px;
background-color: #fef0f3;
padding: 10px !important;
height: 30px !important;
width: 355px;
}

any help Greatly Appreciated :)

https://wordpress.org/plugins/ridiculously-responsive-social-sharing-buttons/