fix: headline in firefox

[AkaraChen]

On Firefox, the spacing between two lines of headline is too large.

This PR fix it.

Env:

1. MacOS 13 + Firefox 111.0.1 => 113.0.1
2. Windows 11 + Firefox developer 114.0b7

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Latest commit: 9d6d792

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[dimaMachina]

Thank you @AkaraChen !

Nice catch, very strange issue, idk why it occurs only for Firefox 🤔

[AkaraChen]

Thank you @AkaraChen !

Nice catch, very strange issue, idk why it occurs only for Firefox 🤔

It's really weird, I couldn't find any information about it.🥲