RWD; Update a bunch of stuff which I've forgotten what it is I've done.

src/partials/_a_layouts.scss

@@ -1,10 +1,9 @@
 .layout_row {
-    display: flex;
-    flex-wrap: wrap;
-    justify-content: space-between;
+    display: grid;
+    grid-auto-flow: column;
+    gap: var(--spacing-horizontal);
 
     .item {
-        margin: var(--spacing-horizontal);
         padding: calc(var(--spacing-horizontal) * 2);
 
         background-color: var(--background-1);
@@ -15,3 +14,13 @@
         }
     }
 }
+
+.layout_row + .layout_row {
+    margin-top: var(--spacing-horizontal);
+}
+
+@media only screen and (max-width: 500px) {
+    .layout_row {
+        grid-auto-flow: row;
+    }
+}