JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css">
<div class="icon-wrapper">
<i class="fa fa-envelope fa-5x fa-border icon-grey"></i>
<span class="badge">100</span>
    </div>

CSS

.icon-wrapper{
    position:relative;
    float:left;
}

*.icon-blue {color: #0088cc}
*.icon-grey {color: grey}
i {   
    width:100px;
    text-align:center;
    vertical-align:middle;
}
.badge{
    background: rgba(0,0,0,0.5);
    width: auto;
    height: auto;
    margin: 0;
    border-radius: 50%;
    position:absolute;
    top:0px;
    right:-8px;
    padding:5px;
}