.css-form input.ng-invalid.ng-touched { color: whatever; }

.css-form input.ng-invalid.ng-touched { color: whatever; }

<form class="css-form">
    <input class="ng-invalid">
    <input class="ng-touched">
    <input class="ng-invalid ng-touched">
    <input type="submit">
</form>

.css-form input.ng-invalid .ng-touched { color: whatever; }