Edit in JSFiddle

ul { padding-left:20px; list-style:none; }
li { margin-bottom:10px; }
li:before {    
    font-family: 'FontAwesome';
    content: '\f00c';
    margin:0 5px 0 -15px;
}

<ul>
    <li>List Item 1</li>
    <li>List Item 2</li>
    <li>List Item 3</li>
</ul>