Assuming you are using a Text entry style question, add the following to the html of the question:

<style>
.ChoiceStructure {
text-align: center;
}
</style>

If you have multiple questions on the page and you only want to center this one, try adding the following Javascript to the Question:

Qualtrics.SurveyEngine.addOnReady(function()
{
this.questionContainer.select('.ChoiceStructure')[0].style = 'text-align: center;';
});

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@AnthonyR The html worked perfectly! Thank you!

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@AnthonyR - thanks for posting! All sorts of useful snippets for us Qubies 0_o

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