Changing Dropdown Icon Bootstrap 4 - Font Awesome

.dropdown-toggle::after{
    display: inline-block;
    font: normal normal normal 14px/1 FontAwesome;
    font-size: inherit;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    content:"\f078";
    border-top: 0;
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    vertical-align: 0;
    min-width:16px;
}