diff --git a/src/_h5ai/public/css/lib/ext/tree.less b/src/_h5ai/public/css/lib/ext/tree.less
index 386187a4..c95888d4 100644
--- a/src/_h5ai/public/css/lib/ext/tree.less
+++ b/src/_h5ai/public/css/lib/ext/tree.less
@@ -24,6 +24,10 @@
         }
     }
 
+    li {
+	clear: left;
+    }
+
     .active > a {
         font-weight: bold;
     }