diff --git a/IPython/html/static/style/style.min.css b/IPython/html/static/style/style.min.css
index 2430e1f..8a9a28b 100644
--- a/IPython/html/static/style/style.min.css
+++ b/IPython/html/static/style/style.min.css
@@ -8070,6 +8070,9 @@ ul.breadcrumb span {
 .item_buttons {
   line-height: 1em;
 }
+.item_buttons .btn {
+  min-width: 13ex;
+}
 .toolbar_info {
   height: 24px;
   line-height: 24px;
diff --git a/IPython/html/static/tree/less/tree.less b/IPython/html/static/tree/less/tree.less
index fe13748..b1d22cf 100644
--- a/IPython/html/static/tree/less/tree.less
+++ b/IPython/html/static/tree/less/tree.less
@@ -103,6 +103,9 @@ ul.breadcrumb {
 
 .item_buttons {
     line-height: 1em;
+    .btn {
+        min-width: 13ex;
+    }
 }
 
 .toolbar_info {