Fixes #11837: grid containers are fixed width now, no longer max-width

css.html

@@ -145,7 +145,7 @@ base_url: "../"
             <td colspan="3">Collapsed to start, horizontal above breakpoints</td>
           </tr>
           <tr>
-            <th>Max container width</th>
+            <th>Container width</th>
             <td>None (auto)</td>
             <td>750px</td>
             <td>970px</td>