Replace zen grids with css grid. Move print styles print style file. Remove Drupal specific styles.

sass/print.scss

@@ -0,0 +1,33 @@
+// @file
+// The print stylesheet for this theme.
+
+// Components
+@import 'components/print-none/print-none';
+
+.skip-link,
+%skip-link,
+.breadcrumb,
+%breadcrumb,
+.pager,
+%pager,
+aside,
+nav,
+footer {
+  @extend %print-none;
+}
+
+@media print {
+  body,
+  .page {
+    background-color: color(white);
+  }
+
+  [role='main'] {
+    width: 100%;
+  }
+
+  :link,
+  :visited {
+    text-decoration: underline;
+  }
+}