给最后一个元素添加样式

    <view class="tui-btn-ml" >
    <button  type="primary"  hover-class='none' class="icon-img3" >联系客服</button>
    </view>
    <view class="tui-btn-ml" >
    <button  type="primary"  hover-class='none' class="icon-img3" >再次下单</button>
    </view>
    <view class="tui-btn-ml" >
    <button  type="primary"  hover-class='none' class="icon-img3" >申请售后</button>
    </view>
                        

<style>
.tui-btn-ml:last-child >>>.icon-img3{
        background-image: linear-gradient(to right, #00C94A , #00AC3F);
        color: #fff!important;
        border: none!important;
        
    }
</style>