Margins for website | WordPress.org

Hi, How would I go about creating margins for my website so the text does not go all the way from the border on the left side of the page all the way to the border on the right? Miraculously, I’ve been able to figure out how to get everything where I want it and just need to fix the margins. I’ve searched for an answer, but the only answers I’ve found seem to be from previous versions of Bluehost, so the solutions no longer work. Thank you very much for your help!!