#select2-multiselect-dropdown .select2-results__options li {
    padding-left: 30px;
    position: relative
}

#select2-multiselect-dropdown .select2-results__options li:before {
    position: absolute;
    left: 8px;
    opacity: .6;
    top: 6px;
    font-family: "FontAwesome";
    content: "\f0c8";
}

#select2-multiselect-dropdown .select2-results__options li[aria-selected="true"]:before {
    content: "\f14a";
}