Semantic-ui-react: Docs: login example from official website is not laid out as expected

[zhuxh529]

Bug Report

Looks like the login example from official website is not laid out as expected(Its not vertically centered on my Chrome, Safari and firefox)

Steps

https://react.semantic-ui.com/layouts/login

Expected Result

vertically center

Actual Result

put top

Version

on website

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[ashvinikumar]

I have created a PR for this issue

[zhuxh529]

Thank you!