/*添加按钮*/ .cnblogs-markdown pre {   position: relative; } .cnblogs-markdown pre > span {   position: absolute;   top: 0;   right: 0;   border-radius: 2px;   padding: 0 10px;   font-size: 12px;   background: rgba(0, 0, 0, 0.4);   color: #fff;   cursor: pointer; } .cnblogs-markdown pre > .copyed {   background: #67c23a; }