Auto merge of #16232 - hiikezoe:justify-content-fix, r=bholley
Auto merge of #16232 - hiikezoe:justify-content-fix, r=bholley

Fix justify-content values.

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This is a PR for https://bugzilla.mozilla.org/show_bug.cgi?id=1352771

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- [X] These changes do not require tests because it's for stylo

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