【7B2主题美化】手机端菜单右下角添加客服图片

直接添加下方css代码，自己改图片

.mobile-box.show-menu-box:after {
    width: 170px;
    height: 160px;
    position: absolute;
    bottom: 0;
    right: 0;
    content: " ";
    background-image: url(https://codeplnt.com/wp-content/themes/b2Jitheme/img/kefu.png);
    background-size: 100% 100%;
}