The workshop board must look spacious on a wide screen and readable on a phone.
The grid has three columns until the viewport is at most 36rem wide. The @media rule then overrides them with one column. Responsive Design will revisit media queries in depth. Find the selector, property, and value in style.css and compare the preview.
Narrow the preview below 36rem; if it cannot resize, briefly change the query to 100rem, run Preview, then restore it.
The completed preview is your reference. The next lesson asks you to build one focused part of it from a starter.
Open style.css and change one declaration at a time.
Run Preview after each change; restore the value before the exercise.