elections2021: Fix headings

elections2021/templates/elections2021/base.html

@@ -22,6 +22,9 @@
     sup {
       white-space: nowrap;
     }
+    .head-alt-highlighted {
+      line-height: 1.2 !important;
+    }
   </style>
 
   {% if page.root_page.matomo_id %}