[RSS Feed/News] How to add custom icon in widget?

[XenForo]

I'm trying to figure it out how to add a custom icon in a widget. I don't mean the Font Awesome icons. I want these to be my own or the Material Icons

This code not working

CSS:

/* member widget*/
.p-body-sidebar [data-widget-key="ranking"] .block-minorHeader:before {;   
    font-family: "Material Icons";
    content: "star";
    padding-right: 9px;
    display: inline-block;
}

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