实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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    <head>
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        <meta charset="utf-8">
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        <title>手册网(www.shouce.ren)
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        </title>
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        <style>
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            .HolyGrail {
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                display: flex;
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                min-height: 100vh;
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                flex-direction: column;
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            }
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            header,
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            footer {
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                flex: 1;
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            }
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            .HolyGrail-body {
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                display: flex;
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                flex: 1;
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            }
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            .HolyGrail-content {
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                flex: 1;