Incorrect aside sticky position

[Hfutsora]

Describe the bug

When there is a top banner and no sidebar, the sticky position of the aside is incorrect.

Reproduction

You can find this bug on vue doc.

Expected behavior

The position of the aside should be correct.

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (16) x64 Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz
    Memory: 20.41 GB / 31.87 GB
  Binaries:
    Node: 16.16.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - C:\Program Files\nodejs\yarn.CMD
    npm: 8.11.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (111.0.1661.44)
    Internet Explorer: 11.0.19041.1566

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[brc-dd]

Vue docs are using a different theme: https://github.com/vuejs/theme

[Hfutsora]

I reproduced this issue in this repository using vitepress.

[brc-dd]

Ah, it's only when there is no sidebar present (footer is shown, it pushes the content up).