doc: give full width to NIC overview page

The wide tables in the NIC overview exceed the normal page width
because of the large number of drivers.

A CSS trick is added to allow displaying the tables in the full width
of the browser window.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

doc/guides/custom.css

@@ -4,6 +4,19 @@
 
 /* Override readthedocs theme */
 
+/* Set full width for all responsive tables of a page.
+ * Usage: insert the following line in the doc.
+ *        .. rst-class:: widepage
+ */
+@media screen and (min-width: 1100px) {
+    .wy-nav-content-wrap:has(.widepage) {
+        background: #fcfcfc !important;
+    }
+    .wy-nav-content:has(.widepage) .wy-table-responsive {
+        overflow: visible !important;
+    }
+}
+
 /* Spacing before a list item must be bigger than spacing inside the item.
  * Complex list items start with a p.first element. */
 .section li > .first {

doc/guides/nics/overview.rst

@@ -24,6 +24,8 @@ Most of these differences are summarized below.
 
 More details about features can be found in :doc:`features`.
 
+.. rst-class:: widepage
+
 .. _table_net_pmd_features:
 
 .. include:: overview_table.txt