Board Thread:Support Requests - Getting Technical/@comment-28011324-20170816165732/@comment-27358554-20170816173019

While that is true, inline styling is quicker to create and better for debugging and testing. You can add the CSS all in one edit and can easily get a preview of how it will look before you publish it. Adding it to the site-wide CSS can help contribute to the slowing down of the site loading and it takes an extra edit. Although if there is hardly anything in you site-wide CSS code, and you don't mind an extra edit, than it isn't a big deal.