.sceditor-container textarea{font-family:Roboto,arial,sans-serif,FontAwesome!important}
.sceditor-button-fontawesome div{background:url(http://i19.servimg.com/u/f19/19/06/98/92/fa-f10.png)!important}
.sceditor-fontawesome{width:220px;height:250px;overflow-y:auto}
.sceditor-fontawesome .fa{color:#333;font-size:20px;text-align:center;cursor:pointer;padding:3px 0;width:20%}
.sceditor-fontawesome .fa:hover{color:#666}
{css}
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" type="text/css" />