将下面的代码放到：Zibll主题–>>自定义CSS即可，里面的utl()，括号里面是图片链接
.sign-img+.sign::before{content:'';position:absolute;top:-144px;left:80px;width:191px;height:187px;background:url(https://img.alicdn.com/imgextra/i1/2210123621994/O1CN013Q07WX1QbIk0oAGPG_!!2210123621994.png) no-repeat center / 100%;}