<label for="form2">Цвет</label>
<div class="product-color">
    <div class="btn-group color" role="group" ng-repeat='color in vm.colors'>
        <button type="button" class="btn btn-primary btn-sm btn-rounded {{color.active}}" ng-click="vm.colorClick($index)"> {{color.color}}</button>
    </div>
</div>