#scrollUp {
  bottom: 20px;
  right: 20px;
  width: 38px; /* Width of image */
  height: 38px; /* Height of image */
}

#scrollUp:before {
    font-family: FontAwesome;
    content: "\f0d8";
    display: inline-block;
    vertical-align: middle;
    font-size: 2em;
    color: #a0b4d0;
}