代码

PHP代码放置于funtions.php或func.php

css代码放后台自定义代码

/*新文章发布图标样式*/
.posts-item{
    position: relative;
    overflow: visible; 
}

.tianyishangke-new-icon{
    position: absolute;
    top: 15px;
    right: 0; 
    padding: 5px 10px;
    background: #ff2626;
    box-shadow: -1px 2px 4px rgba(0, 0, 0, 0.5);
    color: #fff;
    font-size: 13px;
    font-weight: 900;
    border-radius: 5px 0 0 5px;
}

.tianyishangke-new-icon:before {
    position: absolute;
    content: " ";
    display: block;
    width: 7px;
    height: 110%;
    padding: 0 0 7px;
    top: 0;
    right: -7px; 
    background: inherit;
    border-radius: 0 5px 5px 0;
}

.tianyishangke-new-icon:after {
    position: absolute;
    content: " ";
    display: block;
    width: 5px;
    height: 5px;
    background: rgba(0, 0, 0, 0.35);
    bottom: -3px; 
    right: -5px; 
    border-radius: 0 5px 5px 0;
}