Getting the questioner

Question

Hello

I want to add a CSS class to the questioner meta box on the question page and I want a condition, like the condition below

$cssclass = $questioner ? 'class' : '';

See the photo below

I mean, what function should I actually use to get the person who asked the question?

Comments

In what context do you want to do that? What code do you already have?

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I edited the question
I actually want to change the background color of the metabox of each question or answer from the questioner. I don't want to do this with pure css. I don't have any code already