diff --git a/plugin/input/key.css b/plugin/input/key.css
new file mode 100644
index 00000000..a54a29f9
--- /dev/null
+++ b/plugin/input/key.css
@@ -0,0 +1,4 @@
+fieldset.input.key div.output {
+    max-height:400px;
+    overflow:auto;
+}