Changes style for head3, closes #2324

Author: JJ

assets/sass/style.scss

@@ -501,6 +501,17 @@ table#TOC {
         padding-top: 3pt;
     }
 
+    tr.toc-level-3 {
+        td {
+            padding-top: 2pt;
+            font-size: 0.9em;
+        }
+
+        td.toc-text {
+            padding-left: 12px;
+        }
+    }
+
     td.toc-number {
         display: none;
     }