portfolio/src/components/Layout.module.css

.screen {
  margin-top: calc(var(--spacer) * var(--line-height));
}

.screen > article {
  display: grid;
  grid-template-columns:
    [full-start] minmax(var(--spacer), 1fr)
    [main-start] minmax(0, 38rem) [main-end]
    minmax(var(--spacer), 1fr) [full-end];
}

.screen > article > * {
  grid-column: main;
}