<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>body {height: 100vh;width: 100vw;display: grid;grid-template-columns: 10em 1fr;grid-template-rows: 6em 1fr;margin: 0;}body .header {grid-column-end: span 2;border-bottom: 1px solid currentColor;background-color: rgb(25, 179, 214);padding: 2em;display: flex;align-items: center;}body .header div {margin-left: auto;}body .nav {background-color: rgb(243, 232, 16);margin: 0;padding-top: 1em;list-style: none;}body iframe {width: calc(100vw - 10em);height: calc(100vh - 6em);border-left: 1px solid currentColor;}</style></head><body><div class="header"><h1>管理后台</h1><div><span>administrator</span><a href="">退出</a></div></div><ul class="nav"><li><a href="demo1.html" target="content">链接1</a></li><li><a href="demo2.html" target="content">链接2</a></li><li><a href="demo3.html" target="content">链接3</a></li><li><a href="demo4.html" target="content">链接4</a></li><li><a href="demo5.html" target="content"></a></li><li><a href="demo6.html" target="content"></a></li></ul><iframe src="" frameborder="2" name="content"></iframe></html>
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