Update base.css

Author: JustDeveloper1

src/documentation/templates/base.css

@@ -1086,4 +1086,8 @@ html:has(.error):after {
 .small {
     opacity: 0.5;
     font-size: 12px;
+}
+
+html:has(.navleft) {
+    overflow-y: hidden;
 }