title: Visual Studio Code CSS error "Do not use empty rulesets"
body: <p>I have been using Visual Studio Code for HTML and CSS. I get an error that does not impair the website, but I would like to know more about it. When I hover over the styling for an ID in HTML, a box pops up and says. "Do not use empty rulesets". </p>
  
  <p>Can anyone provide more information on "empty rulesets" and explain why Visual Studio Code (or any other editor) would warn about an empty ruleset?</p>