I'm working with the new Inputs but don't change the icon color when I select.

<div class="col-12 col-sm-12 col-md-12 col-lg-12 col-xl-12">
    <div class="md-form md-outline form">
        <mdb-icon fas icon="user"></mdb-icon>
        <input type="text" id="user" class="form-control" name="user" autocomplete="off" formControlName="user" mdbInput AlphanumericDirective>
        <label for="user">User</label>
    </div>
</div>