diff --git a/src/_h5ai/public/css/lib/ext/tree.less b/src/_h5ai/public/css/lib/ext/tree.less
index 3ae36756..b73a2338 100644
--- a/src/_h5ai/public/css/lib/ext/tree.less
+++ b/src/_h5ai/public/css/lib/ext/tree.less
@@ -23,6 +23,10 @@
         }
     }
 
+    li {
+	clear: left;
+    }
+
     .active > a {
         font-weight: bold;
     }