una/modules/base/groups/template/popup_invite.html

<div class="bx-def-padding" id="__popup_id___wrp">
    <div class=" bx-form-input-wrapper bx-form-input-wrapper-text">
        __text__
    </div>
    <div class="bx-def-margin-top bx-clearfix">
        <button class="bx-btn bx-def-margin-thd bx-invite-accept" type="button">
            __button_accept__
        </button>
        <button class="bx-btn bx-def-margin-thd bx-invite-decline" type="button">
            __button_decline__
        </button>
    </div>
</div>