Grid: Center justify text content

Author: nginx-jack

assets/css/v2/style.css

@@ -450,7 +450,14 @@ nav {
 
   .content-layout {
     display: grid;
-    grid-template-columns: var(--grid-content) var(--grid-side-callout);
+    grid-template-columns: 1fr minmax(
+        auto,
+        calc(
+          var(--grid-content) +
+          var(--grid-side-callout) +
+          var(--grid-column-gutter)
+        )
+      ) 1fr;
     column-gap: var(--grid-column-gutter);
   }