body::before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background-image:url(https://picsum.photos/1280/720)!important;background-attachment:fixed;background-size:cover;background-position:50%;opacity:.4;z-index:-1}body{position:relative}.main:has(.post-single){background-color:rgba(255,255,255,.8);position:relative;z-index:1;border-radius:10px;box-shadow:0 4px 6px rgba(0,0,0,.1);padding:20px}.dark .main:has(.post-single){background-color:rgba(0,0,0,.8);box-shadow:0 4px 6px rgba(255,255,255,.1)}.toc{// ... 现有样式 ... background-color: rgba(255, 255, 255, 0.9);transition:background-color .3s ease}.dark .toc{background-color:rgba(30,30,30,.9);border-color:#444;box-shadow:0 2px 10px rgba(255,255,255,.1)}.dark .toc-title{border-bottom-color:#444;color:#ccc}.dark .toc a{color:#bbb;border-bottom-color:#444}.dark .toc a:hover,.dark .toc a.active{color:#fff}#cmButton{background-color:#4caf50;border:none;color:#fff;padding:10px 0;text-align:center;text-decoration:none;display:block;font-size:16px;margin:10px 0;cursor:pointer;border-radius:12px;transition-duration:.4s;width:100%}#cmButton:hover{background-color:#fff;color:#000}.dark #cmButton{background-color:#333;color:#fff}.dark #cmButton:hover{background-color:#555;color:#fff}