08 type scales: media queries aren't affecting the CSS custom properties

[somascope]

The media queries are missing the targeting of :root, which is where the variables are scoped at the top of the CSS file.

In the videos (2nd video, "Custom Properties Type Scale", at ~10:22), we see:

@media (min-width: 480px) {
  --base-size: 1.15em;
}

But instead, it should be:

@media (min-width: 480px) {
  :root {
    --base-size: 1.15em;
  }
}