fix: update sidenav styles

Author: mostafaei2002

docs_theme/src/scss/styles.scss

@@ -177,7 +177,15 @@ ol.linenums li {
   text-shadow: 0 1px 0 #fff;
 }
 
-//
+#table-of-contents {
+  @extend .rounded;
+  background-color: #f5f5f5;
+  border: 1px solid #e3e3e3;
+  padding: 0.5rem;
+  margin-bottom: 1rem;
+}
+
+// Temproary fix for mkdocs settings
 .headerlink {
   display: none;
 }