Prowlarr/src/UI/Settings/Notifications/CollectionTemplate.html

<div class="row">
    <div class="col-md-12">
        <ul class="notifications thingies">
            <li>
                <div class="notification-item thingy add-card x-add-card">
                    <span class="center well">
                        <i class="icon-plus" title="Add Connection"/>
                    </span>
                </div>
            </li>
        </ul>
    </div>
</div>