Once you’ve chosen the overall page width, it’s time you decide how much of the page width do you want to dedicate towards content. Content is the main body of the page, where your readers will read your posts, pages and everything that you have to offer.
The minimum content width should be 60% but any percentage from 70 to 75 is preferred by most businesses. The rest of the width is for the sidebar to fit in.
You can choose to have no sidebar. Let’s say if you’re a journalist or a blogger who prefers to have links, discussion and everything else within the content section. Then, that’s a perfect example for why you would want to use 100% width for your content.