Hello Kayla, Ben here - your Shopify Guru!
You can do this using the rich text editor for your product descriptions. Just highlight or select the text you would like to centered in your product description. Then use the text alignment button.
More information on how this works can be found here.
I hope this helps! Feel free to reach out if you have any further questions :)
Ben C - Shopify Guru
Hi Ben! Thanks so much for your response. I think I worded my question poorly. I'm providing a screenshot of how my products are appearing. I'd like the description to be below "add to cart" and taking up the entire width of the page, like where I drew the box. Seems like the text is stuck on the right side, as if the page is split into two columns.
Thanks again for any light you can shed on this!