The grid column gap challenge doesn't ensure that your declaration is within the .container rule. This means you can put the grid-column-gap declaration in a different rule and still pass the challenge.

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. add the following code below the .container rule

  div {
     grid-column-gap: 20px;
  }

3. Click run and the test passes

This issue persists throughout a lot of the Grid challenges. I propose that we update the regex to prevent the test from passing if a closing curly brace is present between the .container selector and the grid-column-gap declaration.