Status makes it very easy to alter your main site widths via the live Customizer. Here you can change your main site width, max width and your content and sidebar widths. So if you want a smaller or larger sidebar, content area or overall site you can change it with just a few tweaks! Browse to Appearance > Customize > General Theme Settings > Site Widths to get started.
Important Notice: You can enter pixels or percentage values, but you must explicitly state the “px” or the “%”. For example 500 would be incorrect but 500px would be a correct value or 60 would be incorrect but 60% would be correct.