<button open-type="contact" session-from="">
                <div class="item">
                    <div class="left">
                        <image src="../../static/kefu.jpg" mode=""></image>
                        在线客服
                    </div>
                    <div class="right"><image src="../../static/yjiantou.jpg" mode=""></image></div>
                </div>
            </button>

去除button默认样式
button{
    border: none;
    background: none;
    padding: 0;
    border: 0;
    line-height: 0;
}
button::after{ border: none; }