XenForo I want to make changes to the first reply in a thread. How do I specify it?

[securedme]

Such as I want to make the avatar of the first reply smaller.

In chrome, I just inspect it and then input the size in element.style of the first reply. Code: element.style { width: 50px; height: 50px; } But how can I specify it in extra.less?

Thanks.

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