.arrow-right-button-button:after {
    // find your icon in font awesome
    content: "f061";

    // move and style it as you prefer
    vertical-align: bottom;
    margin-left: 5px;
    color: rgb(99, 99, 99);

    // stuff necessary to make it work nicely
    font-family: FontAwesome;
    font-style: normal;
    font-weight: normal;
    font-size: medium;
    display: inline-block;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: auto;
    transform: translate(0,0);
}