naive-ui/demo/documentation/components/layout/enUS/absolute.md

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Absolute Position

All layout components can use absolute positioning. It can be used when you want content scrolling inside fixed area.

If you have set position='absolute' on sider and want the sider and its adjacent n-layout or n-layout-content to display in right manner, you should apply mode='absolute' on layout or layout-content too.

<div style="width: 100%; height: 240px; position: relative">
  <n-layout position="absolute">
    <n-layout-header style="height: 64px;">
      Cool Header
    </n-layout-header>
    <n-layout position="absolute" style="top: 64px; bottom: 64px;">
      <n-layout-sider position="absolute">
        Cool Sider
      </n-layout-sider>
      <n-layout position="absolute" style="overflow: auto;">
        <n-h1>Long</n-h1><n-h1>Long</n-h1><n-h1>Long</n-h1>
        <n-h1>Long</n-h1><n-h1>Long</n-h1><n-h1>Long</n-h1>
        <n-h1>Long</n-h1><n-h1>Long</n-h1><n-h1>Long</n-h1>
        <n-h1>Long</n-h1><n-h1>Long</n-h1><n-h1>Long</n-h1>
      </n-layout>
    </n-layout>
    <n-layout-footer position="absolute" style="height: 64px">
      Cool Footer
    </n-layout-footer>
  </n-layout>
</div>